Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b62230d63a73c3e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 08:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63b7d5136a28414fe9b89512e60f1a9d SHA-1: 1735a0e916ab7d08b00e12841ae1b11b8d4e488f SHA-256: 0b62230d63a73c3ee7f98fa56b1c63a9ff9f97aab9bee72517d4b3354578e733
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 redirector service known to host malicious content. The document body also contains a direct link to this redirector, suggesting an attempt to lure users to potentially harmful websites. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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=igcse+biology+z+notes+pdf
    • http://files.irishshepherdshuts.com/uploads/1/3/2/6/132683475/zubivuzuwamolufuka.pdf
    • http://files.kimcarmona.com/uploads/1/3/0/7/130738714/finofeki.pdf
    • http://rofipojak.crypticrite.org/uploads/1/3/1/4/131454696/narosawoweruf.pdf
    • http://kipuka.megacandyimporters.com/uploads/1/3/2/3/132303195/8fd71824630.pdf
    • http://jarul.genuineplusco.com/uploads/1/3/1/4/131453133/0c363adc201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/medicare_change_of_address.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/furapizomibodunenejex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8357326041.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/35779618940.pdf
    • https://cdn.shopify.com/s/files/1/0433/1995/1513/files/bidukidurejogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/70640867697.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/68717924612.pdf
    • https://cdn.shopify.com/s/files/1/0433/9862/7495/files/helicopter_aerodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/mepafofapufodaxuwikexebov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/22653224001.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_off00006100.bin
eabe3c2d5ce71092b8109acabd112c579df03e2de7f033590a08c49993acddd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 5248 bytes
font_01_sfnt_off000072f2.bin
98ba76ee1e2777fa3abe12b7171c0969d77f2b0caeec55ede43e9f99cb0369ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F2 13184 bytes

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