Malicious PDF — malware analysis report

Static analysis result for SHA-256 28022431c1a91d3c…

MALICIOUS

PDF

77.1 KB Created: 2020-07-09 11:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: afbabc86006c435cb4fd13b298015f37 SHA-1: 0297a76dad2dcd6b235077441b2b161099898d59 SHA-256: 28022431c1a91d3cb360ac5a2aeead7a1d31b7fc0d38a7903ccabc7b91c7f246
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/pify?keyword=musashi+pdf+romana In PDF document text
    • http://files.fivegirlsbaking.com/uploads/1/3/1/4/131453560/segamiluzif.pdfIn PDF document text
    • http://files.caricaturesbymichaelangelo.com/uploads/1/3/1/3/131398250/zimavipawefisenexine.pdfIn PDF document text
    • http://files.nileinstitute.org/uploads/1/3/1/1/131163920/zidetaxes-fofisidomawatug-mojolimipananav-gokepem.pdfIn PDF document text
    • http://files.flupciyouth.com/uploads/1/3/1/8/131858043/razozuwa-famizusu-ketidu.pdfIn PDF document text
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdfIn PDF document text
    • http://files.missmaudiesmenagerie.com/uploads/1/3/1/3/131398264/letujuvamotijapinuk.pdfIn PDF document text
    • http://files.eurojpconsulting.com/uploads/1/3/0/7/130739558/7415372.pdfIn PDF document text
    • http://files.matchmypartytheme.com/uploads/1/3/0/7/130775651/rujezela_jawabar.pdfIn PDF document text
    • http://files.partnershipfortheartsgroup.org/uploads/1/3/0/8/130874339/tosubolaxava.pdfIn PDF document text
    • http://files.alfonso-oliva.com/uploads/1/3/1/6/131606395/xunime_tepupopagom.pdfIn PDF document text
    • http://files.rockingcleatherandboutique.com/uploads/1/3/1/3/131383510/7375545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jajafer.files.wordpress.com/2020/06/88791577113.pdfIn PDF document text
    • https://bulimogip179696400.files.wordpress.com/2020/07/juzozefo.pdfIn PDF document text
    • https://jopawetudame.files.wordpress.com/2020/06/91309771437.pdfIn PDF document text
    • https://gutelum.files.wordpress.com/2020/07/60675001475.pdfIn PDF document text
    • https://pomosoku.files.wordpress.com/2020/06/1229466856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wogol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 14396 bytes
SHA-256: df16e75d9b05acca8b78945eac25a8014c7566425d7bdfb234bb5714aa6353d1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 4936 bytes
SHA-256: ea2156802a4e4708a71513bfee51fa9a91276d0884f78842a21ac79867e2b85c
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10704 bytes
SHA-256: 10ab43417e070e650da210dda317363363ac8c537023942d10dcd844836aabd0