Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05057bbb0051af2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 12:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0b1183b43b86f333c427f17a868de4 SHA-1: 36f7b2569bc1bf385cd1868adb7c0252b444e26c SHA-256: f05057bbb0051af27f74dd88cb9a5fb26b508351c318f005afc5bb01e9f26b62
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded artifacts reveal a large number of links, many pointing to external PDFs hosted on shopify.com, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to 'https://ttraff.cc/wix?keyword=a+valediction+forbidding+mourning+literary+devices', which is identified as a malicious redirector.

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/wix?keyword=a+valediction+forbidding+mourning+literary+devices
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/68628816369.pdf
    • https://cdn.shopify.com/s/files/1/0437/9276/0994/files/xedukikezoluxitajir.pdf
    • https://cdn.shopify.com/s/files/1/0447/9349/5709/files/l_adjectif_interrogatif_quel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/john_paul_jackson_dream_interpretation_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/92748392315.pdf
    • https://cdn.shopify.com/s/files/1/0448/1040/4000/files/autonomous_engineering_colleges_in_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0430/7461/7511/files/dixojowanodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/can_levaquin_be_crushed.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/pmbok_6_agile.pdf
    • https://cdn.shopify.com/s/files/1/0458/0881/2198/files/performance_parts_for_2008_chevy_silverado.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/walden_thoreau_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.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_off00006b90.bin
f4a4f3025e0fec8f770231b9fd39b5e3bad74486f1d9a9c12776de66b88e46c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B90 5632 bytes
font_01_sfnt_off00007ea6.bin
64ca87f546d44e0daca48cc4c9a0cafc8290b839a11453a4e81e432167fb91e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA6 10148 bytes