Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b905581cba51b9…

MALICIOUS

PDF

44.0 KB Created: 2020-08-19 03:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7d190defaaeda2e30601a2e2288ff5 SHA-1: 20130fdfb83564a6813c1ae730633bb57cdcf348 SHA-256: 78b905581cba51b968f2f9b8f8000538891e30e9c55a4a5626da00a6f733c6b2
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent link, disguised as a motivation letter template, redirects to a known malicious URL (ttraff.cc). This indicates a phishing or redirection attempt to deliver a malicious payload or lead users to scam content. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent.

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.cc/pify?keyword=template+of+motivation+letter+for+university
    • http://files.staceyagdern.com/uploads/1/3/1/3/131398377/nawojoperudo_julufemamajusur.pdf
    • http://mujek.versaillesfourthofjuly.com/uploads/1/3/1/4/131482962/11065356076b.pdf
    • http://weboka.storiesbyeli.com/uploads/1/3/0/7/130738837/nevibu_zosidigifajis_peguz_nugoviwerusawuk.pdf
    • http://files.showmeshortlineblog.com/uploads/1/3/1/8/131856163/8cf0b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/badlapur_full_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/loctite_263_tds.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/76870110231.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/nine_inch_nails_only_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/wezakutizijaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/0803/1893/files/basic_java_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/kuxikenemuwiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/6130/5756/files/rekituxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/fumimojob.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_off00006e17.bin
3d63ed92588b2510c4b81d6f5b5312ddf15b96abb45ed7ff3c2de619b7620334
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 5156 bytes
font_01_sfnt_off00007f99.bin
26f91a54becc714cb7d119f565f6b111f709cd39cc40cf7ae30e23adc99d5a48
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F99 10404 bytes