Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae84d9fe758c220…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 21:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3bd87a161087dcb9abf739cd5c6b28 SHA-1: 722d76f239cc588a17020dc1f3f7ea91b7bd5123 SHA-256: 4ae84d9fe758c22061ef0ce6a76f762301864424d5ced0da4f17b7021adc12ff
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded URLs, many pointing to Shopify domains. One of these URLs, 'https://ttraff.cc/pify?keyword=logical+riddles+with+answers+pdf', is a known malicious redirector. The document body, though heavily obfuscated, also contains this redirector URL, suggesting the primary purpose is to lure users to malicious content via these links.

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=logical+riddles+with+answers+pdf
    • http://files.radicalartisticdesigns.com/uploads/1/3/2/7/132740900/080d34.pdf
    • http://luxopono.emergingaging.com/uploads/1/3/1/4/131408027/6716994.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/titrasi_argentometri.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/tinkers_construct_2_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/mogaza.pdf
    • https://cdn.shopify.com/s/files/1/0450/3745/3470/files/geometric_progression_word_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/damezitufotagasino.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/34595235637.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/gunilekanu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8846/8376/files/pofevejeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/the_antarctic_treaty_1959.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_off0000634b.bin
5d4bb7d1bde079892e711190aa5fd1da0dc0cdc3789d29bae0961663ddf786a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 5448 bytes
font_01_sfnt_off000075df.bin
27dc38f3f62bc3c29f6b14b7d031dd7518d84abbf6892a06db3d4c5a4cdf5833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 10012 bytes

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