Malicious PDF — malware analysis report

Static analysis result for SHA-256 b221112fd72b1e55…

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 08:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcc792d677e79c4fa718f620ac4bac0 SHA-1: 02c48b740c85d84d8e94f23fa05e1b4e6b6fe2aa SHA-256: b221112fd72b1e55edb269fb1286519be32953c596fc1872520972284d7d9896
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 benign Shopify domains and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Chocolat favoris franchise information' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also 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/pify?keyword=chocolat+favoris+franchise+information
    • http://pafexi.asrpci.org/uploads/1/3/2/6/132683080/5483140.pdf
    • http://files.explorequeretaro.com/uploads/1/3/1/0/131070375/1ca1e7e2294.pdf
    • http://files.thetasteofjamtland.com/uploads/1/3/0/7/130739525/379f82a.pdf
    • http://files.theoxfordscientist.com/uploads/1/3/1/4/131437615/fivan.pdf
    • https://cdn.shopify.com/s/files/1/0438/9077/0088/files/best_bengali_songs_ever.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/tufowigonakiwezapajale.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/49094876040.pdf
    • https://cdn.shopify.com/s/files/1/0434/3162/4853/files/dermatitis_atopik_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0438/3273/7942/files/mezodaforoxux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/zonoxuxofirosadived.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/karelolezajemubevebov.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/torawomudasolasudedewej.pdf
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/authorization_letter_to_claim_salary.pdf
    • https://cdn.shopify.com/s/files/1/0433/6563/0102/files/sozet.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_off00006108.bin
365d51d92e5417465a6f8d97e34ee3ce22cc9c91c8da2b8236c599de4cc2a450
pdf-font-stream PDF embedded font (sfnt) at offset 0x6108 5088 bytes
font_01_sfnt_off0000722c.bin
dce03f5ac50bc83200503bc0f3be26c661fea696354fa115869d0366b81f66c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x722C 10748 bytes