Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f63de16a943d2b0…

MALICIOUS

PDF

46.0 KB Created: 2020-08-05 08:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e49ee6d5aae23fcc4d329ec0dc436e7 SHA-1: 58ca38ac47ddf9b6617d0c60e0fe3ee63f0870f5 SHA-256: 7f63de16a943d2b0aafb54f79a9c6392c34420972a7f5a447661977e17fca2f8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.com/pify?keyword=android+studio+java+programming+tutorial+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Android studio java programming tutorial pdf' and a URL, aligning with the advance-fee scam lure identified by heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=android+studio+java+programming+tutorial+pdf
    • http://files.xanderclaypool.com/uploads/1/3/1/3/131383719/c47c9be66df.pdf
    • http://files.kelscustomcabinets.com/uploads/1/3/1/4/131452997/c6dee3.pdf
    • http://files.cassandramlambros.net/uploads/1/3/1/6/131637169/sotalovekarofo-famibijanos-xaxetakanudus-savimis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/21460789209.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/ludiliwadajivajeti.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/90207349370.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/zutibizivalibugadov.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/56464414313.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/63618617523.pdf
    • https://cdn.shopify.com/s/files/1/0439/4277/2891/files/32052163075.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/bewugefikuzipaxeza.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/78967561882.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/87657157613.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/amway_products_catalogue_with_price.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/nobuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/67163406229.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_off0000741a.bin
b5c2143835bd8071b7cb5ffb5da5ac1d855d2e0cb68824521bfde4cd15f614b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741A 5484 bytes
font_01_sfnt_off000086bf.bin
7c8562d26329548c3c34fdd20d3d90b5227a8a4f18503df26a81f02a206e9adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BF 10620 bytes

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