Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a27bbc684d03c00…

MALICIOUS

PDF

40.0 KB Created: 2020-09-16 14:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcfdea7329e9eae74c63e009a807b427 SHA-1: 08004cf5b30806bc981c2a69d38096b0e6515a0f SHA-256: 4a27bbc684d03c00bc154e2f32dc0f17074a8a82846486e6654d2d46553ecfff
152 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many of which point to a redirector service. The primary malicious URL, https://ttraff.me/wix?keyword=assassin%2527s+creed+identity+android+apk, is designed to lure users with the promise of game-related content, likely leading to a further malicious download or phishing page. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=assassin%2527s+creed+identity+android+apk
    • https://e13a8b0f-cdbb-4ea6-8e26-413b335614fc.filesusr.com/ugd/5ea691_963c9421f94540feb0d1c2b7950de757.pdf?index=true
    • https://3d87419a-8e71-46ef-a8c9-d887ae51aa0a.filesusr.com/ugd/70e7d4_a5df0ad1285c418cb658611f8926a766.pdf?index=true
    • https://586e8a90-0d0a-4c97-8b13-97902f2516b0.filesusr.com/ugd/49f5ef_dec61db6ed054ff894322309400609d5.pdf?index=true
    • https://812bca8f-8894-4a7e-85eb-d7dcde6a3015.filesusr.com/ugd/c57cae_788cce77602d447881ffef8b5cba5129.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0466/2552/1829/files/17875747448.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/dikutoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/89437570509.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/65429680412.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/89326219150.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/one_clue_crossword_answers_chapter_15.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sikotifukiv.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_off00005b45.bin
3df6d4b26322bae7173075804442e002e5d4f0a6f05ac57e290063c790db1da4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B45 5224 bytes
font_01_sfnt_off00006d2b.bin
73bbbe22d876e386d54998829c575a7c44aaa6c528accad1a9853558af2cce2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 11684 bytes