Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3c0e12385091f3…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 22:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11191ced82a0574fcbf0ffae2f8cf218 SHA-1: 823c67ee4f1f16804b6a0abfc0d344f70197950f SHA-256: 5c3c0e12385091f334073d3d5ead52c294c6cf05c40f9c2eb2cc7c79b4769d6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors, including a critical finding for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a book title, suggesting a phishing or scam attempt. The presence of many external PDF links further indicates an attempt to direct users to potentially 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=born+a+crime+chapter+1+pdf
    • http://files.smallbusinesscapitalus.com/uploads/1/3/1/4/131437074/vuliwigipevo_defapezajalazo_zutusemada_funofemibi.pdf
    • http://files.enfieldover50scommunity.org/uploads/1/3/0/9/130969514/6524080.pdf
    • http://files.hallpt.com/uploads/1/3/1/4/131406950/jugipowijos.pdf
    • http://jixezal.jennybermas.com/uploads/1/3/1/3/131379578/394d76.pdf
    • http://files.whitewatercottages.com/uploads/1/3/1/8/131856456/kexaxaru-woroji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/34985909437.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/metipokip.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/minigeguw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/53881082476.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/sokonigodav.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/boardwalk_empire_season_1_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/87216099616.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/10161777350.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7048/files/pevam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/arbaeen_nawawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/biochemical_test_for_staphylococcus_epidermidis.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7254/files/livro_riscos_ambientais.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_off000066ac.bin
7b8e9bda9d8f439809c2e4a3319b2b3cc85a24611cd6cb249e99a7e9b2f875c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5284 bytes
font_01_sfnt_off00007886.bin
627ffd0f82c7c5690935f8be24a3808afbe0a2e69770e83686b4784ba0826490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7886 9640 bytes

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