Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd8e234fb00b2f0…

MALICIOUS

PDF

51.5 KB Created: 2020-08-06 06:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c8d6c1ddc93319c8b60acb1f5749964 SHA-1: 3c935ed4bf919a5cdb6a7b3c28f62dec3efc4871 SHA-256: 0fd8e234fb00b2f0d079105572ba24ca54ea89b961dbcbc930fb6e2a6df24cee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, suggesting an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains text related to 'biography of leaders pdf' and a URL that aligns with the heuristic findings. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential SEO poisoning or link farm tactic to distribute 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.cc/pify?keyword=biography+of+leaders+pdf
    • http://bizegov.kcolvininteriors.com/uploads/1/3/1/3/131383775/519a0ea3660.pdf
    • http://files.nikkidarling.co.uk/uploads/1/3/2/6/132681359/2885029.pdf
    • http://files.maysclub.org/uploads/1/3/1/6/131636855/993968.pdf
    • http://files.anthonygibbs-art.com/uploads/1/3/1/3/131383384/117009.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0797/5330/files/94335853853.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/lavabaludutari.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/76677680698.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/75008779189.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/the_hobbit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/40321268294.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/foxit_editor_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/dovekuvitunojamazote.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/musufirajepugeri.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/55268946404.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/70913434194.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_off000089fc.bin
1f32463489c9ec262f5aa0305445363fd231353688b4ecb3d825cd0686bcd0d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x89FC 5456 bytes
font_01_sfnt_off00009c94.bin
f1f0ddb4cd89cd4443c2b16bf067d1411c7af94e9de04e4c317ca9519bfd729b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C94 10712 bytes