Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fff8543fe89b8f…

MALICIOUS

PDF

49.3 KB Created: 2020-08-02 07:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328c6a057b44260e287f99f7b09110d1 SHA-1: 29384d0e7ed6dbb05baa2267e6ee30bf15faa478 SHA-256: 10fff8543fe89b8f5f03cd5a47707a10097b54e9b6beaf346dad86395ad64d13
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=kayne+aram+build'. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious sites.

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=kayne+aram+build
    • http://files.lewisinteriors.com/uploads/1/3/0/7/130775862/bd8848.pdf
    • http://files.familylawyerminnesota.com/uploads/1/3/1/6/131607712/jubigi_vomikewupinoz.pdf
    • http://files.undefeatedcourage.org/uploads/1/3/0/8/130874554/8652281.pdf
    • http://files.cullomptonartshouse.org/uploads/1/3/1/3/131379213/3515541.pdf
    • http://files.salsaconrumba.org/uploads/1/3/2/7/132740214/816e19889.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/29293422814.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/passive_voice_present_simple_past_simple_exercises_pdf_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/54228960245.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/nofozoxibokolunikobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/tafirij.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/gobet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/lisogiwidagakixirax.pdf
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/kijekejepobatizavogu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/fetudux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/jolimebezatixowes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/enlightenment_now_pdf_steven_pinker.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6135/files/36466991916.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/65259960525.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_off00007649.bin
101288e6f1990cfbf07df7f0ebee2f95d21ee5fc4690aa823ee8f0d57563d3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 5004 bytes
font_01_sfnt_off00008740.bin
9395f3446426ae1610911e6f5d4d069675abd047085af82866051b4d5dc0dc8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8740 16024 bytes

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