Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c7d78803925c5…

MALICIOUS

PDF

53.9 KB Created: 2020-08-15 14:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75d121f6470dc7edf3b818e8f1e2a2b SHA-1: e778801572767a3da5b78597aebe323f3a14bbd2 SHA-256: 1b9c7d78803925c5d1a9400ef3feb5addf2ccc85e3440715264a9d6d95c674e2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a LinkedIn company page cover photo template. The document body, though heavily obfuscated, contains this URL and numerous other links to PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for the malicious content. The ML classifier strongly indicated maliciousness.

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=linkedin+company+page+cover+photo+template
    • http://files.delissimobuntingford.co.uk/uploads/1/3/1/0/131070230/lotozapa.pdf
    • http://files.mountainspiritswellness.com/uploads/1/3/0/7/130739247/kenigapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/vasevisosokukufewuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/47646018822.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/set_theory_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5906/9599/files/88680899241.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4456/7197/files/world_pool_association_blackball_rules.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/946941619.pdf
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/adenocarcinoma_de_colo_uterino.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/kamal_sharma_clinical_cardiology.pdf
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/ri_20-_97.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007402.bin
7e73439c05269a2c011296939c373c846ad793ae8ecbd47f8cde46aed7ba0d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 5476 bytes
font_01_sfnt_off00008678.bin
78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 2092 bytes
font_02_sfnt_off0000901d.bin
1e8fe71fa929a4dc02587866b462cadc52cc9beceaa663eea34cb731cb959483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901D 10460 bytes
font_03_sfnt_off0000b40b.bin
e347d1554c2b332734abdfba76094272d01981b1852802b18a4dd2deca2aaa2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB40B 16444 bytes

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