Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d791dffea6a62…

MALICIOUS

PDF

56.8 KB Created: 2020-08-12 15:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bb43354a1c12d0ad2feff53e2eb9bf39 SHA-1: fa84c7844440e7654f9097d36caea3134e1ccf38 SHA-256: e28d791dffea6a62371e5d3d5bebdcb2738f35eafd8d16cad936cd7db30ee57b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics indicate a deliberate attempt to direct users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'business process documentation' and a URL that mirrors the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=business+process+documentation+example+pdf In PDF document text
    • http://files.dirtyapron.co/uploads/1/3/1/3/131382239/6255773.pdfIn PDF document text
    • http://files.smgengr.com/uploads/1/3/2/6/132695730/vikamu_gevipetewamutol.pdfIn PDF document text
    • http://pagikesoz.beadsbybrandy.com/uploads/1/3/0/7/130738732/7935026.pdfIn PDF document text
    • http://files.mplsalpineski.org/uploads/1/3/0/7/130775341/lekafinigijuwupob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/el_capitalismo_historico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/xodumebazuxopovajexenesex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/the_celluloid_closet_vito_russo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1313/4743/files/xevulir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/64188484316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3436/9438/files/mysql_php.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93366398369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/tugelofufuxazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/0197/3657/files/bernt_oksendal_stochastic_differential_equations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26450283228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3448/3605/files/39335367675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/zavowufinok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9168/1699/files/womulanoge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/27203458212.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72AE 5420 bytes
SHA-256: ba9397cbb3a8a0f100a11843ac95cdbef8c213e8a711b39be5fd8223ab4f4eee
font_01_sfnt_off000084f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F4 7424 bytes
SHA-256: 76771e389b81067b04f95b2a73a124afbe26a973ddcf163bf84804ec2cdf638f
font_02_sfnt_off00009991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9991 10272 bytes
SHA-256: 21fb7e66be4a20e4a0fecc5dde357bc7ca7a8c52dfbf6a26a19fe9bbcc26d8f6
font_03_sfnt_off0000bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDC 17176 bytes
SHA-256: 3dc88664ad88edbb49b52bd74c7fb7fff5994ec604a54008f2841cfefa279f18