Malicious PDF — malware analysis report

Static analysis result for SHA-256 35572fd65ee23cb2…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 22:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d5acbfe34a27bc3772f17beb4bfd82 SHA-1: 74a792a730e8b432b3e4f47b8c4ecbf1471d4df3 SHA-256: 35572fd65ee23cb2f62eaf361f316ecdd826a64f3a68758f5ac766b13b0b098c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a redirector, which is a common technique for distributing malicious content. The document body, though heavily obfuscated, contains text related to a "Messenger app for iPhone 5s" and a URL that appears to be part of a link farm designed for SEO poisoning. The ML classifier also 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=messenger+app++for+iphone+5s
    • http://files.recconnectionmiami.com/uploads/1/3/1/4/131482931/rukasunurej.pdf
    • http://files.anglers-rest.com/uploads/1/3/1/8/131856333/labatojiguv.pdf
    • http://files.sccellars.com/uploads/1/3/0/9/130969254/95259d6ad07dca.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/lababox.pdf
    • https://cdn.shopify.com/s/files/1/0463/3064/2587/files/facebook_reactions_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/plantas_alimentcias_no_convencionais_panc_no_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5291/6119/files/ghostscript_print.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4170/files/lefuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/xesejotoxujumikusoxop.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/57085429046.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/vofarubuwozofitenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90554838216.pdf
    • https://cdn.shopify.com/s/files/1/0431/8733/9413/files/50601775498.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/timifozaponunanobejegunab.pdf
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/32559164103.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/vujijapuditive.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/
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006522.bin
88bd170edad1e337a92e508cf40f96cf7e15d71cc564663a8d5716313cc32a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 5260 bytes
font_01_sfnt_off0000770c.bin
ed2db47b63420d79cd22ed799e825ec66193b5369ac6d4e3878f2ecbb8d6d61c
pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 10308 bytes