Malicious PDF — malware analysis report

Static analysis result for SHA-256 6379d937635a160a…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 15:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1ca7753fb9bbb1d30e69358f0313130 SHA-1: ca906c0a2f88b4c0811868de3461b2712f388e29 SHA-256: 6379d937635a160a4d723aefbfab52097f96528e665b192a14a6426af6e7f40a
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.com/pify?keyword=irrigation+engineering+by+rk+sharma+pdf+free+download', is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious content distribution scheme, likely delivered as a spearphishing attachment.

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=irrigation+engineering+by+rk+sharma+pdf+free+download
    • http://files.refractband.com/uploads/1/3/1/6/131606262/jolifilaba_sotujopi_gamavi.pdf
    • http://files.sportinghackney.co.uk/uploads/1/3/1/4/131454143/mibisiv.pdf
    • http://files.sabrinamottafineart.com/uploads/1/3/2/7/132740204/7437036.pdf
    • http://files.eunjukang.net/uploads/1/3/0/9/130969242/da91b84a0.pdf
    • http://files.journalbinet.com/uploads/1/3/2/8/132814050/cad5c84574a05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/41596852388.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/niterunupeniwopozaguri.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/75733146489.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/69817085529.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/xiwavikilosuxugami.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/79264193166.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/minecraft_backpack_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0430/8441/5143/files/nanudezimodajap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/teninaserazefode.pdf
    • https://cdn.shopify.com/s/files/1/0438/2546/3456/files/manual_pole_saw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/89828599044.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1765/files/xepoxaful.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c46.bin
34ef019b48e65eeacbabb66eb7da070d24731d013a50bc4fb0d0bf2d3fa4e758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C46 5792 bytes
font_01_sfnt_off00006fe0.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 2116 bytes
font_02_sfnt_off000079a9.bin
d4d314ae401751048bd6d1d870d65e3245345ae9190478eb1f7b2492ffc28a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 9964 bytes

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