Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a41fa433d32b59…

MALICIOUS

PDF

37.8 KB Created: 2020-07-28 04:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 379156e24956fde0ca5123c98cbb2a46 SHA-1: bd9a0956fd753ec8e2eefb4961e14c6fe0385a61 SHA-256: a2a41fa433d32b59c8c69253bcd6c9115e379bbbceb133300e66da2921cf6ae0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector (ttraff.ru). The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, suggesting the content itself is not the primary lure but rather a vessel for the malicious links. The presence of a link farm further supports the intent to drive traffic to potentially harmful 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.ru/pify?keyword=spanish+english+dictionary+apkpure
    • http://files.deldelorm.com/uploads/1/3/1/8/131856276/2877569.pdf
    • http://files.mysteryandhorrorllc.com/uploads/1/3/2/7/132740814/dosemapesapoz.pdf
    • http://files.astrologytruths.com/uploads/1/3/2/6/132681336/desoguk_lamafel_dulowev_wivinebodipux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/98928182276.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89352644259.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/dekomoxukesebuvozopi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/pawusapupog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/72195823297.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/fibutiliwodemevamuvud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7551/8107/files/4182861652.pdf
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/difasase.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/gelugubirudejejanesaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/9172/0347/files/11789162594.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/gofivewodiwosifarokudik.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056b9.bin
e8095ca265e5c5697d07b2c80685019badcc1b9e45fe8e466ee4ca6b9d85ecba
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B9 5488 bytes
font_01_sfnt_off0000694f.bin
1227e7458d1035f622b82a3b280ecdcf9824fa5fb872c432411d3b6634621717
pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 9684 bytes