Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f9e3dca4c86f7c…

MALICIOUS

PDF

47.2 KB Created: 2020-07-27 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ed55f8295cf8bec4c4690edff3882bb SHA-1: ada9425c061156b72dbcd9c2999fb31186695998 SHA-256: 16f9e3dca4c86f7caabe225654d0c57067385f0735b94d032a5d32a16ec5ab6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links redirects to a known malicious domain, ttraff.cc, suggesting a phishing or malware distribution attempt. 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/wb?keyword=capitalization%20worksheets%20for%20middle%20school
    • http://files.spectrumpsychological.net/uploads/1/3/1/3/131379301/konuzerat_solavexikedonu.pdf
    • http://files.usna99.com/uploads/1/3/1/4/131454316/edfa8.pdf
    • http://files.yorkhomebrewers.org/uploads/1/3/1/4/131438582/37207e4820.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/50952331667.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/mowuzisebebonexajogepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/98111068611.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/39729292001.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/67393474151.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/runaguselelijukogasusitup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/48983473560.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/3930701573.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/wirelose.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/ligirutixigunevomugomuvag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/82490210643.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/sazebodamojozufus.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/lawatoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6618/files/67908863553.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8679/files/wefilalosiwidoteneka.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aef.bin
bef35ceeaecf3f778df42445863aadce485e75c3ec40c5299ba67d779df58444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEF 5412 bytes
font_01_sfnt_off00008d44.bin
8d068c6eda7e369f8b16beb6161b5e9516a678cb41ee568da0d4b3416a551b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D44 10028 bytes

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