Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4f77a1239de8b0…

MALICIOUS

PDF

43.4 KB Created: 2020-08-09 15:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97d2f666c95ab4bb5c6260f7632111d SHA-1: e102298a6a4ed136803820ff3b867d81108a21a2 SHA-256: 5a4f77a1239de8b0b4c03adeb07e3fefb2085fad027f548f0a8d3943a22e8bdc
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 external PDF files hosted on various domains. One of the primary links, 'https://ttraff.cc/pify?keyword=computer+lab+chart+pdf', is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure.

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=computer+lab+chart+pdf
    • http://files.willshowstopper.com/uploads/1/3/1/3/131379567/kedebanironivu_lunexoj_nezefokidubez.pdf
    • http://files.cosmicsistershop.com/uploads/1/3/0/9/130969364/8126109.pdf
    • http://files.designcareersclub.org/uploads/1/3/1/4/131437276/wabofo-juluwe-nezaxewux.pdf
    • http://files.curiouscreativecritical.com/uploads/1/3/2/6/132682585/xemoxajepitediw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/dusisidebelipetavufuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/dudefuboguxixopewit.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9127/files/forerupinuwebiwopuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8650/3326/files/jutupalavux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/48461658765.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/xusavosegudure.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/bpmn_2._0_standard.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/the_next_millionaire_next_door.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/vugevoludowunazalajef.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/lemige.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/1-_99_fishing.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/chemistry_lab_apparatus_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/xogojunibemuzijizu.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_off00006a42.bin
e90207d4692e4fc73f617bf63204c19ae9f41123e388867362905c3f298e9ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A42 5260 bytes
font_01_sfnt_off00007bee.bin
fe7bb48376c53194833fe45ff0a6d4ecdad521c7b488f5730c3889f8e80cc964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEE 10672 bytes

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