Malicious PDF — malware analysis report

Static analysis result for SHA-256 159cbdb5e71a1c66…

MALICIOUS

PDF

42.3 KB Created: 2020-08-13 02:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a21d3a3429eaebf1716a10128f600a SHA-1: afc0f8e9745a8c345052b024a35dd20e81301432 SHA-256: 159cbdb5e71a1c66d9dd82c2fc08f460a6668dd0130076117cd39e339ce5125d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but the primary link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The document body, while containing a relevant topic, is heavily obfuscated and likely serves as a lure.

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/wb?keyword=advantages%20and%20disadvantages%20of%20international%20criminal%20court%20pdf
    • http://files.tigroneypress.com/uploads/1/3/2/6/132695354/a74c91d4f99600.pdf
    • http://files.tom-lane.com/uploads/1/3/0/8/130813736/bawapuxe.pdf
    • http://files.thesekidshavetalent.com/uploads/1/3/1/3/131379875/ba8e8fba62b41c0.pdf
    • http://vevirita.adcofoundation.org/uploads/1/3/1/1/131164278/26430a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/94192841406.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93867881616.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/fetibizotisutojidok.pdf
    • https://cdn.shopify.com/s/files/1/0448/6791/1842/files/fusionner_plusieurs_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5241/files/24258542002.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/35070508900.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/seruwamo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4731/3827/files/bivuzasot.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/rogojedagusuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/12351553840.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/temporal_lobe_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/piano_chords_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesibilefonupas.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_off00006625.bin
913854bf0b9fe8839fedf07f9468c844316169f4194f1e6f9bfccf9be7f0fce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 5524 bytes
font_01_sfnt_off000078e4.bin
c5156689e9a6371418ca2eea063476f7e7ed8864567991364af4d5afe3d56adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E4 10120 bytes

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