Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e369dc72a6d7ad…

MALICIOUS

PDF

42.4 KB Created: 2020-08-25 00:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3c26743338ce288709d5362e1cf657 SHA-1: 947d2f4088cce32a610841df96e02553216ba07f SHA-256: e6e369dc72a6d7ad10e81b7e3221287f0212efe87e46784bb08d5c09325ccf0e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a common technique for SEO poisoning or distributing malicious content. One of these links, https://ttraff.cc/pify?keyword=rubber+sheet+singapore, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector are sufficient indicators of malicious intent.

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=rubber+sheet+singapore
    • http://files.mediaartsperformance.com/uploads/1/3/1/4/131406140/kidodoselaburobegi.pdf
    • http://files.jerseybluedar.org/uploads/1/3/1/0/131070165/zujukenajudodul-kezazibelafalo-guxawegu.pdf
    • http://zapefemal.aide4paws.com/uploads/1/3/0/9/130969627/supivol.pdf
    • http://bitofoge.estudiosdelaescritura.org/uploads/1/3/1/6/131606060/sibobinatufogadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1767/3636/files/simaronikuxavinirodigod.pdf
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/saly_salon_game.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/29315339004.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/41416304024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nofalefupipalivudekim.pdf
    • https://cdn.shopify.com/s/files/1/0437/5429/1361/files/85842036114.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/30062416141.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/encyclopedia_brown_boy_detective_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/84709589978.pdf
    • https://cdn.shopify.com/s/files/1/0449/6372/5480/files/50441166195.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_off00005b8c.bin
121fb610b2ac96ddb12d418914453adce9c8a36b2118fa46206b1c626913c5b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8C 5196 bytes
font_01_sfnt_off00006d2f.bin
a89bd734c29870e2eba7f3770fb6839266d7890edb35b2939b928ea653997094
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 15248 bytes