Malicious PDF — malware analysis report

Static analysis result for SHA-256 73af2bda57c41b1e…

MALICIOUS

PDF

44.9 KB Created: 2020-07-14 16:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75cdf42c933fae63461cfe8be55ba174 SHA-1: 698d42bd6c97d1fd7f1e430c416123a41633d659 SHA-256: 73af2bda57c41b1eb2a585b0e40ceb6337e0ec04489f78531cc1ab48b0cbcde4
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 the primary link directing to a known malicious redirector. This suggests the document is designed to lead users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a social engineering attack.

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=first+law+of+thermodynamics+for+open+system+pdf
    • http://files.premieredogs.com/uploads/1/3/1/8/131860938/linugulok_vapusiloganuk_tajile_petugomowaw.pdf
    • http://files.aurorapanonica.com/uploads/1/3/1/8/131871980/laxesozodanukud.pdf
    • http://files.grayhawkpto.com/uploads/1/3/1/4/131453332/df8206d.pdf
    • http://files.paulsumich.co.nz/uploads/1/3/1/4/131438758/powevozoza-dajojezizamu-rojukomutigu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/midegatiwodamowajojolepol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81143567733.pdf
    • https://nubamozi.files.wordpress.com/2020/07/63102682398.pdf
    • https://mazokotafon.files.wordpress.com/2020/07/xiwagilixiveba.pdf
    • https://nalevadasedo.files.wordpress.com/2020/07/ruwubenaliribusoxaba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/19329979045.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/panabuzupateserisux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/fenefonixopupawomid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/64317892553.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0730/files/9696228561.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/xotemamisezafenon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.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_off00007027.bin
d62b1e602ddc4db3e6fd7194cb53407fcc9ded9dc9e5cf6911f8801bd189b6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7027 5332 bytes
font_01_sfnt_off00008235.bin
29e591d110da1234f13fcd8c362fadc39d1ba3dbae3b9573fe2da21aa34991ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 10796 bytes

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