Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8644a854ae97915…

MALICIOUS

PDF

62.5 KB Created: 2020-08-18 23:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b06d966bbbece0799e3fec2e2dcf1971 SHA-1: b75e29b0edf53a3a07d08e1fe67739c123ec5686 SHA-256: d8644a854ae9791587e74902f0fb12e688a2bd5ba406faf27f6ae693bd02be46
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Electronics interview questions and answers for freshers'. This link, https://ttraff.com/pify?keyword=electronics+interview+questions+and+answers+for+freshers, leads to a malicious site. The PDF also hosts a link farm with numerous external PDF links, many of which point to potentially malicious or unknown domains. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=electronics+interview+questions+and+answers+for+freshers In PDF document text
    • http://files.davidkanmd.com/uploads/1/3/0/7/130775623/b7a8c47fa12bac4.pdfIn PDF document text
    • http://gawekuvad.neomoonart.com/uploads/1/3/0/7/130776078/pobezavomadisot-zemaf-givaxi.pdfIn PDF document text
    • http://files.scissiocontrols.com/uploads/1/3/2/6/132695629/470927.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/1/0428/9685/1111/files/mcdougal_littell_geometry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5679/8615/files/kendo_grid_footer_template_function.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7606/7228/files/bedowiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/29364549066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/87876879130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1184/9892/files/at_t_directv_channel_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/pituwuwow.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB792 5344 bytes
SHA-256: 546fb39facd4b34cfa7bdd66a958d77277c82ef1d90aa6b969c77b55ae520308
font_01_sfnt_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 10360 bytes
SHA-256: ea0b65fd9c923fbe7a4cad9e0d328d43d88a08bb064fb72ad5b6b2897421acd0