Malicious PDF — malware analysis report

Static analysis result for SHA-256 b356de72068382e7…

MALICIOUS

PDF

40.0 KB Created: 2020-08-14 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c0d3f5247f97a4ddda304ad248440d SHA-1: 4a106a72f3772d4f6083e46d2778d501995f8ee2 SHA-256: b356de72068382e7b8a2ceff7935e5f0e0a45501cf901f45581147371f348d7d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=bitsy+grant+platform+tennis'. Additionally, it features a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm structure strongly suggest a phishing or malware distribution attempt.

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=bitsy+grant+platform+tennis
    • http://files.naturesedge-fl.com/uploads/1/3/1/6/131606094/6022478.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/system_dynamics_palm_3rd_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/lugej.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6383/files/animal_habitat_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/john_deere_d155_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4158/5314/files/2020_calendar_printable_one_page.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/diwido.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/95462493379.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/36265280843.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/tadot.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/a_therapist_s_guide_to_brief_cognitive_behavioral_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/vurelufigozevesanife.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e8c.bin
01d45eb0fde7a27cc9dd6a7fad910a66149a6245a7910d9e4f23f325ede1fe57
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8C 5372 bytes
font_01_sfnt_off000070c3.bin
d5ac92f2ce194e484e5e35a9d83cfc46bdd63c410a5df4b16d3c7e31a9107652
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C3 10128 bytes