Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a167f31f70f094…

MALICIOUS

PDF

49.8 KB Created: 2020-07-28 06:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992312b12e85c51da14c30482ed96dd7 SHA-1: 68169995c6438aaaca6804f3fc00f1ad561111bf SHA-256: 15a167f31f70f094a866531a39acb001353a78978497d6d5595a3691a941d4a2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'acknowledgment sample form philippines'. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to redirect users to harmful 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.ru/pify?keyword=acknowledgment+sample+form+philippines
    • http://files.upatnightcomedy.com/uploads/1/3/0/7/130775970/942095.pdf
    • http://files.littleladyo.com/uploads/1/3/0/9/130969004/furopigolijur.pdf
    • http://files.baldguyfishing.com/uploads/1/3/1/4/131406518/xuzudikudatatoz.pdf
    • http://files.newsalembaptistky.com/uploads/1/3/0/9/130969172/2914052.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/85500854874.pdf
    • https://cdn.shopify.com/s/files/1/0437/1261/0472/files/zoxefidewurerodizarijazuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8619/2546/files/30305956877.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/sewogalivikibegazus.pdf
    • https://cdn.shopify.com/s/files/1/0436/9098/3574/files/57956855473.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/88314756164.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/15339509648.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/pupixed.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/ximigujopuzuruxet.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/zodijozupefogel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/71672484674.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/78008137094.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/zisilemugibuxizuvi.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_off00008567.bin
2a7f471f55890235e06df47fd6b3307625d92d031ecab46eba3606f6968fa636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8567 5500 bytes
font_01_sfnt_off000097fd.bin
18a79ac8c058a1b1401e3ebee7c9a4c2870a2b0cf024a0199b202433b72e68fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FD 9844 bytes

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