Malicious PDF — malware analysis report

Static analysis result for SHA-256 314fa6bb9643c478…

MALICIOUS

PDF

39.1 KB Created: 2020-07-31 21:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aa9b2ebcaa7178bc73a991800630f37 SHA-1: 761e6b377c20e4dce799d4cb7d4376f125ee1f1e SHA-256: 314fa6bb9643c4788f66c857130292106558e9e613538ec676bb149aceae056f
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 16 external links, and one of these links, https://ttraff.com/pify?keyword=breathe+fresh+yd-+706+manual, is a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm suggests a phishing or scam attempt, likely to lure users to malicious content.

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.com/pify?keyword=breathe+fresh+yd-+706+manual
    • http://files.fremontsailingclub.org/uploads/1/3/1/4/131411596/1edbaea5795.pdf
    • http://files.thestudiocleveland.com/uploads/1/3/1/4/131452935/gereserebuwen-gopizezefa-falituf-birero.pdf
    • http://files.bhavsingh.com/uploads/1/3/1/4/131455475/jutavat-gadobogajit-nixebokeduki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/favemiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/0138/7936/files/14114131628.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/38651498427.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/60499292523.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/sepisetulopetuzepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/54632471515.pdf
    • https://cdn.shopify.com/s/files/1/0432/4442/1282/files/fevigijebolix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/1345764051.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/wavobulovozazido.pdf
    • https://cdn.shopify.com/s/files/1/0430/7206/1591/files/vifelizabijikejidaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27984898694.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/67713359329.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_off00005852.bin
c4345f8a956750875f4c3635b3cb89e44f17382f6fb100dc5fd3099032731f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5852 5704 bytes
font_01_sfnt_off00006ba7.bin
20c897b06549ee3a0975e56ed47cb86479b7b6682d87126c9ba7757613f7dd02
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 10608 bytes