Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4e5871d47fa73…

MALICIOUS

PDF

64.6 KB Created: 2020-07-31 02:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96163ba31e43a6ae1a263e3afec5470 SHA-1: a3a46eec7fb394c6f464787cc95904a9532f00d4 SHA-256: 70a4e5871d47fa736324c004c858cc014cb3aff9194004012f01d45eb8a9d8dc
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 redirector service. The primary malicious URL identified is ttraff.ru, which is known to host malicious content. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

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.ru/pify?keyword=auto+differentiation+pdf
    • http://files.northwestbiscotti.com/uploads/1/3/0/7/130776735/516b53cb.pdf
    • http://files.oasystec.com/uploads/1/3/2/8/132814024/5386157.pdf
    • http://files.proudlion.co.uk/uploads/1/3/0/9/130969637/585974417d05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/80305587833.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1678/files/98428293377.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/tozotagu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/12036296704.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/gudomewuledoviripabove.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/dawofavavafefubil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/41434063373.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/65931428592.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/50206021311.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/molewulenumabofuli.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/makuxizipawevu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/49032925515.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/neradifatigu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8588/files/81753645201.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_off0000c0f7.bin
dab9c7c5ce3d3cb46887cedc77f171d00b0e052c6de360e99d54745dbc063265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 4696 bytes
font_01_sfnt_off0000d0f3.bin
b295dcb168c2d63e4ad98f71c76691fbd4c94ef4ae28914cec736488c462e5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 10596 bytes

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