Malicious PDF — malware analysis report

Static analysis result for SHA-256 109ce3833665adbc…

MALICIOUS

PDF

36.2 KB Created: 2020-08-07 09:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccfceea081748f214d4c4a6b9ef95489 SHA-1: 60bdbe4786c21b2db6c780bfac604206b495813b SHA-256: 109ce3833665adbcd24388ba254afdb8140eac119c8d94676d79cd43ccf41399
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.com/pify?keyword=roberts+apperception+test+manual+pdf`. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links and the redirector strongly suggest this document is part of a malicious campaign, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=roberts+apperception+test+manual+pdf
    • http://files.hereshegrowsagain.com/uploads/1/3/1/6/131607232/4599346.pdf
    • http://files.firststepcleburne.com/uploads/1/3/2/3/132303286/3077189.pdf
    • http://files.convictedmerch.com/uploads/1/3/0/8/130813644/rimapudizudi.pdf
    • http://files.clinmicrolab.org/uploads/1/3/0/7/130739654/lipifazox-bedifibok-wiketasak.pdf
    • http://diwefakig.koinlando.com/uploads/1/3/0/7/130775732/wujiradadore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/b._ed_first_semester_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/vuvonukitokotaxewimom.pdf
    • https://cdn.shopify.com/s/files/1/0429/3256/8220/files/iraqi_colloquial_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/opencv_2._4_13.pdf
    • https://cdn.shopify.com/s/files/1/0447/9533/0717/files/biggest_cities_in_the_us.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/mysterious_benedict_society.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/scotts_speedy_green_2000_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/titufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/modul_barisan_dan_deret_aritmatika.pdf
    • https://cdn.shopify.com/s/files/1/0446/5659/1011/files/ankle_tendonitis_exercises.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_off00005088.bin
768fec5da471652963a21ef043c0fac2b7b00c8aa992ee23ba08151665d9aa95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5088 5448 bytes
font_01_sfnt_off000062f5.bin
619d7347f71724af78e6acbf1042fcd0e381c6ccbcc8f9c29d4f898bc64c3119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F5 9696 bytes

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