Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7dafc45dae5732…

MALICIOUS

PDF

49.8 KB Created: 2020-11-09 13:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 986d7880311d32d69b95971114e3d3f7 SHA-1: 5f224a1cf6b078592ff5be15a561000902274469 SHA-256: ff7dafc45dae57323eabaf9c2313c579d9857d6e72e1462a433748d0abde6a29
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?keyword=hacked+blockheads+apk+unlimited+resource'. The document body also contains this URL, suggesting it is the primary lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/strik?keyword=hacked+blockheads+apk+unlimited+resource
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5f95f45031317.pdf
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f8841de2e509.pdf
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f9705e5d2305.pdf
    • https://wulonuvesiga.weebly.com/uploads/1/3/4/3/134362584/54e17.pdf
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5fa6e6746ce4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79caff5e-2d3d-4b74-a50b-85ba257f6f9b/fufogexupajulizelixepe.pdf
    • https://s3.amazonaws.com/fujadabez/problem_solving_strategies_engel_download.pdf
    • https://s3.amazonaws.com/fosawef/kowixafetalobivorere.pdf
    • https://s3.amazonaws.com/nokiwovowus/coraline_download.pdf
    • https://s3.amazonaws.com/ravuxudibure/zekuzobatogejax.pdf
    • https://s3.amazonaws.com/temujonuwu/period_8_apush_multiple_choice_test.pdf
    • https://uploads.strikinglycdn.com/files/f3f9e231-7990-41f4-8f46-ef9c46b6ef87/tangled_emma_chase_read_online.pdf
    • https://uploads.strikinglycdn.com/files/c38e9ac5-8ee0-450c-bb14-f6fff556cca9/minecraft_pe_launcher_pro.pdf
    • https://uploads.strikinglycdn.com/files/46b4f7ff-9a9c-4f66-a70a-a585244d38af/75697485460.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d4b.bin
83cd5238a3efc48c0209f3d91cd634e1968ca1af708b132ec49df4d6f68ae3c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4B 5476 bytes
font_01_sfnt_off00007fb3.bin
f951d571fb397097eba4d8606c299100ba78379cbedfec391d2095e79f7614f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB3 10656 bytes
font_02_sfnt_off0000a464.bin
79a8b90f55ff6552f604b654de9415a285e7315ac61835edf8590ffdbde93965
pdf-font-stream PDF embedded font (sfnt) at offset 0xA464 16272 bytes