Malicious PDF — malware analysis report

Static analysis result for SHA-256 474af5f148028543…

MALICIOUS

PDF

47.6 KB Created: 2020-08-07 13:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 214affbfbee1bad4aa2beab248754263 SHA-1: 77160bf67058a3bef5b3fb182424656802374a60 SHA-256: 474af5f1480285438d683b2a609f5734118700956b3ba628c9c483c2a796549d
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at ttraff.ru. This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector. No scripts were extracted from this sample.

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=bereavement+therapy+pdf
    • http://fezamaxo.alpinecivicclubboard.com/uploads/1/3/1/4/131438641/wuxire.pdf
    • http://files.myroncotton.com/uploads/1/3/0/9/130969364/9373256.pdf
    • http://files.shaymadden66.com/uploads/1/3/2/7/132740900/zopizudevenap-wabumifir-vefoni.pdf
    • http://files.ross-gash.com/uploads/1/3/2/8/132816036/71c1c89accb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/gepuxasedap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/jezexowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/vedeluporaziwadox.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/30343069003.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/buwuxawiruwexatepak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/mabiwuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/purorigekogobukite.pdf
    • https://cdn.shopify.com/s/files/1/0436/2059/7922/files/jeropirenixovobetuwaxesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/tobufino.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_off00007c64.bin
ccc9d99acef4e75c81e905126cf9f48d91238ba096c6a6d8e4c7e56da54f5157
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C64 5280 bytes
font_01_sfnt_off00008e46.bin
26cf973d6f4601b581635e727c144e9fa7afa2c8481e97074e8c7d940e26a60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E46 10368 bytes