Malicious PDF — malware analysis report

Static analysis result for SHA-256 9582c8a47f5e5346…

MALICIOUS

PDF

36.8 KB Created: 2020-08-04 11:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 164e69999da1ff4bbd185e90acf865b0 SHA-1: b0138b71628e10ef94817980e63dc11f6c3fa318 SHA-256: 9582c8a47f5e5346138f378591ae9cc3bf5ebd239938ac3d8a05fe14bbce01f9
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'Oxford bookworms pdf free' and the malicious URL, suggesting a lure for free content. The presence of a PDF link farm heuristic further supports the malicious intent of distributing links. The ML classifier 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=oxford+bookworms+pdf+free
    • http://files.irelandandchina.com/uploads/1/3/0/9/130969001/xopitamumosiludaf.pdf
    • http://files.carolgiambalvo.com/uploads/1/3/1/4/131407571/bavikadufidega.pdf
    • http://files.tonycovena.com/uploads/1/3/0/8/130873728/zobuwidug.pdf
    • http://files.glospeycomputers.com/uploads/1/3/0/7/130739169/zixegoribuv_tulaxisoxavef_zolonu_vekuxerad.pdf
    • http://files.elproducts.com/uploads/1/3/1/8/131871994/nugafag_bufuribewip_sisesosu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/verbal_analogies_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4283/9455/files/jojovak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/50936892303.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/texajutivarutadejesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/24202195555.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/69705550351.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/vixajajulifunotupexavoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/9706/1531/files/6201108482.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/fuvepexofomajadegakefojo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/tevinimikat.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/jimuzolesoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/nevegofewobidiwur.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_off00004c0d.bin
66b173303f92fb20829ac29a18de797476b722caac0e0a82afc95a91a0dbb966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0D 5336 bytes
font_01_sfnt_off00005e34.bin
ada128f9c5f84bf0c50cc15b019a4d90629ada7feed4d8844ddb9727058b0064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 14028 bytes

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