Malicious PDF — malware analysis report

Static analysis result for SHA-256 940e2b7f63f3089b…

MALICIOUS

PDF

33.1 KB Created: 2020-08-12 12:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab173f028cc90cba37854dce86f0833 SHA-1: b3935ab8da693149abe41daead24d3fe4d82bfdc SHA-256: 940e2b7f63f3089b4a3e737b88e03a434ecf72af347637816b8e6966c2d27fdb
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate downloads, with one specific URL pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'aircraft structures' and the malicious URL, suggesting a lure for users seeking technical documents. The presence of numerous external links, many hosted on Shopify, indicates a coordinated effort to distribute content via SEO manipulation.

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=aircraft+structures+for+engineering+students+pdf+free+download
    • http://files.bethelcrcyouth.com/uploads/1/3/0/8/130813777/nozejagajalu.pdf
    • http://files.noboundariesdm.com/uploads/1/3/1/8/131871786/7557892.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/journal_el_watan_algrie_d_aujourd_hui.pdf
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/guwesosud.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/86546619523.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/78614266902.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/sukawuveleg.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/dokisidedomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/samugimuvawowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/11589674051.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/wavovu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/kokodow.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/modozeginefimilipaselu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/94698017961.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/risapo.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_off00004611.bin
a659935eabe96964db0e1557f02753d89c0bcf3207016659a2547d6cac38c713
pdf-font-stream PDF embedded font (sfnt) at offset 0x4611 5404 bytes
font_01_sfnt_off0000588a.bin
6b761cc34beffd52d70024df9d4d1179b54416f57c7c82dec594d23214b5db47
pdf-font-stream PDF embedded font (sfnt) at offset 0x588A 8976 bytes