Malicious PDF — malware analysis report

Static analysis result for SHA-256 0408154bda2b92c4…

MALICIOUS

PDF

34.2 KB Created: 2020-08-14 12:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80f80222ca42c245a464dea97d484a6 SHA-1: a825684c0b64b3b0415059efa3014eafb7d3a818 SHA-256: 0408154bda2b92c4b3b66b0f94a538e691d39e8c79cea2a6b4384f8ae9b06e1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains what appears to be obfuscated text and URLs, suggesting an attempt to disguise malicious content.

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.com/pify?keyword=lancer+carbonator+manual
    • http://files.thevanservice.com/uploads/1/3/2/3/132303382/midepuzulumug_sijete_linogi.pdf
    • http://files.kaybethavery.com/uploads/1/3/1/1/131164048/mezadavabibabagiz.pdf
    • http://files.ambcircleoffriends.com/uploads/1/3/1/8/131871494/supare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/titeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/esl_ed_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdf
    • https://cdn.shopify.com/s/files/1/0432/2141/8147/files/66649531049.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdf
    • https://cdn.shopify.com/s/files/1/0435/3556/4949/files/agama_adalah_nasihat.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/27522372126.pdf
    • https://cdn.shopify.com/s/files/1/0436/9956/8795/files/retixogalapevefexojag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/arcswat_2020_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/system_analysis_and_design_notes_for_bca_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/applied_bayesian_statistics_with_r_and_openbugs_examples.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_off00004905.bin
d486bc204f4677c62b127a34313917be926f605dfb984594dea78c74928b0699
pdf-font-stream PDF embedded font (sfnt) at offset 0x4905 4848 bytes
font_01_sfnt_off00005965.bin
44d6ad27f2ffcef110c414e66d3ff81cec2cbbb0fdf886cada4ac5cfee5765d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 10136 bytes