Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc50b02a1eaedb…

MALICIOUS

PDF

57.0 KB Created: 2020-08-16 00:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e98f76436e24f1b9faca7e0ab613b6 SHA-1: 437c0a8981257b7ef041f0ae212df49981843794 SHA-256: 81fc50b02a1eaedb50d7c44a73c0f4c3b9463f8e40dd963fe75bc311457253e7
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'wagon wheel chords and lyrics pdf' and the malicious redirector URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=wagon%20wheel%20chords%20and%20lyrics%20pdf
    • http://files.csunigc.com/uploads/1/3/0/8/130814121/burunuxonum.pdf
    • http://files.shawneecabinets.com/uploads/1/3/1/3/131382583/dulutorefopipaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/alimentation_entrale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7348/6496/files/xekasewijefavuzoxafevem.pdf
    • https://cdn.shopify.com/s/files/1/0447/1855/5292/files/byzantium_summary.pdf
    • https://cdn.shopify.com/s/files/1/0430/6848/9881/files/48020983023.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/77478942294.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/69615203901.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/mekolugotefawevidifimono.pdf
    • https://cdn.shopify.com/s/files/1/0438/6865/1680/files/47958328513.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/bipafuzuzibazoloweda.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/vubujawuzamoposufapipo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/96533688269.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e93.bin
086881192dff0b943d1e121aa0fa1fe81d859ca278546cf518682c853b8aa7bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E93 5624 bytes
font_01_sfnt_off000091c7.bin
8ad0a2427a9848d1f10578c08fb724ee189747e019ff37ba30cb4c6fbc2c3e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 15352 bytes
font_02_sfnt_off0000c18b.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 16204 bytes