Malicious PDF — malware analysis report

Static analysis result for SHA-256 100b4d2340ecc2f2…

MALICIOUS

PDF

38.4 KB Created: 2020-08-03 05:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b4075e8ec0a73418db3a2fc9cff976b SHA-1: 140ef4638c12ac15861dc099cfe05565340263e0 SHA-256: 100b4d2340ecc2f215f51d9da9c945017b3f125053cad14938bce7e4767ad8bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links redirects to a known malicious URL, suggesting an attempt to lure users to malicious infrastructure. 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.com/pify?keyword=gold+lion+lyrics
    • http://files.pestcontrolfortworth.net/uploads/1/3/1/6/131637056/7505306.pdf
    • http://files.katiephomes.com/uploads/1/3/1/1/131164063/8376041.pdf
    • http://files.iananc.org/uploads/1/3/1/3/131397971/regotovabir-jubub-xofinawadiru.pdf
    • http://files.dhruvk.com/uploads/1/3/1/3/131380342/43015852ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/37870582539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/24098519831.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/63059895745.pdf
    • https://cdn.shopify.com/s/files/1/0431/0918/7750/files/xikawozedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/88809407694.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibuzos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/dla_form_2500.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/72812322459.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/diwanizediwatigikaxigu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/68104550676.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/61365524580.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/vinemovo.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_off00005812.bin
86bb170fe855c9f49e5774ca60341efdd7722cb8b5c6055a480906b11bdf083f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5812 4856 bytes
font_01_sfnt_off000068b4.bin
c6c694309cf6e0204e38ec3719a9e58ad24ac910f06b0831b87d40a1b1c72ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B4 10948 bytes