Malicious PDF — malware analysis report

Static analysis result for SHA-256 089312f3cf122194…

MALICIOUS

PDF

42.4 KB Created: 2020-08-24 00:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3aa817bcaed2cc85737e209e29c140f SHA-1: 0d49d13d0428aa3f07097ab2797cd42b58252ebd SHA-256: 089312f3cf122194fa1841aed7008022905cad924bc86403331b2b09b3a6fa8d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=predicting+before+reading+worksheet'. Another heuristic identified a large farm of external PDF links, suggesting an attempt to distribute malicious content or lead users to phishing sites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports the attack pattern.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=predicting+before+reading+worksheet
    • http://gaten.outdoorsweddingceremoniesbymililaniwoods.com/uploads/1/3/1/1/131164250/3308882.pdf
    • http://files.diegelrabbitry.com/uploads/1/3/1/3/131384599/19b50a2c739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4995/0111/files/18632423094.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/27777879996.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/36502585986.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/55750629260.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/bootstrap_template_admin_page.pdf
    • https://cdn.shopify.com/s/files/1/0433/3083/0494/files/kepipiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6975/8874/files/64974248252.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/xefunobigesob.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/coordinate_geometry_straight_line_formula.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/arpegios_para_guitarra_clasica.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/45124750998.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006620.bin
ef4548c85a183c615cf2b7517a69211dd3778c091b4462590aadf56d261e1390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 5548 bytes
font_01_sfnt_off00007903.bin
fb086f3d83f4e2aeb589be0f034de6b35606fd01ac298c71eb0e0f21cddfe129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 10488 bytes

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