Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6e8205636e6c09…

MALICIOUS

PDF

36.9 KB Created: 2020-08-04 15:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89855e4cd8322d9dbd027d8189782511 SHA-1: b852503ae80e0160ed4979e41392566b73407ee6 SHA-256: 0c6e8205636e6c09c68ac6ee4e6cf7417bb062d9506e1fc57c3f5f6bd252e119
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of the primary links, https://ttraff.cc/pify?keyword=dk+ching+building+construction+illustrated+pdf+free+download, is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure for a free PDF download, which is a common tactic for distributing malware via phishing. No scripts were extracted, but the presence of numerous malicious and potentially malicious URLs indicates a high likelihood of this document being used to redirect users to malicious sites.

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=dk+ching+building+construction+illustrated+pdf+free+download
    • http://files.fustlerthefemalehustler.com/uploads/1/3/0/7/130739839/gaxiwoloxakutenuboj.pdf
    • http://jukubate.getorganizedbydeb.com/uploads/1/3/0/9/130969300/zexurobudezulumaxe.pdf
    • http://files.azure-heros.com/uploads/1/3/1/6/131606798/rodabukifatix-kakux-toxun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4439/7471/files/69502076566.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/9185213891.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/61948015346.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/maps_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/8867/4967/files/mavogebakodaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/43602495737.pdf
    • https://cdn.shopify.com/s/files/1/0434/0187/1512/files/python_dictionary_append.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2267/files/98720144282.pdf
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/vawaxexenosop.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/majurojonitixagizak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/2727507340.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_off00005085.bin
ab4eb5f00bce63b0da29269fb4cc2aefe0a990d3401a9e3030b8d1a624130510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5085 5712 bytes
font_01_sfnt_off0000640c.bin
aa2aa34660d4567d47a5d63144526b5003965d3c7ef1086d20ffa87d1e1e2e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 10132 bytes

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