Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1592b9b7783592b…

MALICIOUS

PDF

62.6 KB Created: 2020-08-14 14:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1e4b8cb27f29e8ffce5b14c6b6f051f SHA-1: 8bdfc1e190ac71a2b6565ba4fed3cc87e7607b48 SHA-256: f1592b9b7783592b2bbcbc9d21471ea9af5373757d27f81e32dd0df13d82d9b2
158 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=explanation+letter+for+late+submission+of+report'. The document body, though partially corrupted, suggests a lure related to a late report submission. The presence of numerous other links to PDF files hosted on Shopify and other domains indicates a link farm SEO tactic, likely to obscure the malicious redirector. 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=explanation+letter+for+late+submission+of+report
    • http://rivamuj.michigantales.com/uploads/1/3/0/8/130874222/7466375.pdf
    • http://files.vawvtrampoline.com/uploads/1/3/0/7/130776656/11eedae.pdf
    • http://files.kangarooislandvet.com/uploads/1/3/1/0/131070604/7a562508.pdf
    • http://files.shavanocreek.com/uploads/1/3/1/3/131398159/tazok.pdf
    • http://tegon.sharonbaptisthamptonva.com/uploads/1/3/1/4/131438539/997d9f1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/80019801346.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3183/files/autocad_3d_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/rosalind_hursthouse_on_virtue_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0433/5730/7039/files/comparison_between_axial_and_centrifugal_compressor.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/sununaxolosilerip.pdf
    • https://cdn.shopify.com/s/files/1/0433/5891/2662/files/best_open_source_reader_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/4255310909.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/senorare.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/investment_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/37359688451.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_off0000ad93.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 2828 bytes
font_01_sfnt_off0000b78d.bin
2866ea6519b5b2905d94aff785c26857c1cd1c2add7712889b579f818a6b79c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 5212 bytes
font_02_sfnt_off0000c92d.bin
6008182200a74be04df41e3ae35709b523b207afcd953e872594c7e3cca7e387
pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 9828 bytes