Malicious PDF — malware analysis report

Static analysis result for SHA-256 84945140e827fe7d…

MALICIOUS

PDF

38.2 KB Created: 2020-07-14 22:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 570c9e8cc1172d345a0c4ee26c297318 SHA-1: 8602a83c3e0a9c44a8badef1a1c03872721bfbac SHA-256: 84945140e827fe7d42733f808b95d51a06951e4f32dcdb0d1308ba4e632d01bf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to SEO redirectors, including one pointing to 'ttraff.cc', which is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to grammar exercises, likely a pretext for phishing or malware delivery. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link-farming or redirection scheme.

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.cc/wb?keyword=present%20simple%20tense%20and%20present%20continuous%20tense%20exercise%20pdf In PDF document text
    • http://files.reading2reading.com/uploads/1/3/0/9/130969555/49253ecafb.pdfIn PDF document text
    • http://files.jeeperzoutpost.com/uploads/1/3/0/9/130968906/pukesimane_mumodonidu.pdfIn PDF document text
    • http://files.animalecologylab.org/uploads/1/3/1/6/131607683/popategajuf_xanodexafavum.pdfIn PDF document text
    • http://files.teacherbehn.com/uploads/1/3/0/7/130776081/jojewujabejepolipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rafopez.files.wordpress.com/2020/06/98898466715.pdfIn PDF document text
    • https://gudumik.files.wordpress.com/2020/06/jifezezimevokinakawidal.pdfIn PDF document text
    • https://vusuletameta.files.wordpress.com/2020/07/jiwigupon.pdfIn PDF document text
    • https://boruporo.files.wordpress.com/2020/07/lofokibivupafopitilafos.pdfIn PDF document text
    • https://xofinositum.files.wordpress.com/2020/07/17866785950.pdfIn PDF document text
    • https://suzoxafa.files.wordpress.com/2020/06/60140324264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/28229767844.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/faxivutodowujed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woburorofinuxup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/rapobusetuzifeke.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58DD 5252 bytes
SHA-256: 3712b1a13086b712f77b95ef6c45e8056fbf9474fb84f548e2a50c6b518b059b
font_01_sfnt_off00006a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A90 9540 bytes
SHA-256: c5b7ee8352f205a8fde304131556a7caebbc3eacf879aaa19a622eda83c02b00

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