Malicious PDF — malware analysis report

Static analysis result for SHA-256 3829b4a3f56fc773…

MALICIOUS

PDF

50.8 KB Created: 2020-08-13 00:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32a5f96d1fbef6c54b8e449bb97e936 SHA-1: 28c7eb9ce593e60564d8274ce090c3be7d0f7f84 SHA-256: 3829b4a3f56fc773e8e0f4428d3493abdb209148e3aa9fcf90c63125e7bf48f4
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at https://ttraff.ru/pify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify URLs, suggesting a lure to download further malicious content or visit phishing 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=anywhere+travel+guide+pdf
    • http://files.msbfitness.co/uploads/1/3/1/3/131381078/nixapi.pdf
    • http://files.d365promotions.com/uploads/1/3/0/8/130813988/169765.pdf
    • http://files.getretti.com/uploads/1/3/1/6/131606397/lowagosemaze.pdf
    • http://files.josephgoff.com/uploads/1/3/1/4/131483719/tosatuvumife_zosifabipis_putox_saraxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/47782419896.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/higiene_seguridad_y_calidad_de_vida_en_el_trabajo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7204/5734/files/if_statement_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/75909842123.pdf
    • https://cdn.shopify.com/s/files/1/0440/3170/5238/files/7329747932.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/jexulutukazet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/18394847746.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/ontology_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/9811751340.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/git_discard_untracked_files.pdf
    • https://cdn.shopify.com/s/files/1/0435/9867/6131/files/45881565370.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/the_lemonade_crime.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_off000079cb.bin
970781a828184c455812c949f22d3cfda426d0082aeffd37c321e7bf9e299181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CB 5140 bytes
font_01_sfnt_off00008b50.bin
f2162043ea1fb1c45346af86e39581a4b79674d6cc786c1d0c4a084c6dc85e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B50 11012 bytes
font_02_sfnt_off0000b008.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB008 4324 bytes

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