Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac3cb30adecad39…

MALICIOUS

PDF

42.4 KB Created: 2020-08-17 13:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb3ae108a34cf7e514c50308a92c373 SHA-1: 735b65f6adba7cb276fe709bb45854053989d93e SHA-256: 2ac3cb30adecad396269090d7cebda0825a1d5a459a14f00e70fbcd5da293e87
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the URL https://ttraff.ru/pify?keyword=platform+bed+frame+wood+full, which is flagged as a malicious redirector. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO manipulation tactic, potentially leading to further malicious content or phishing attempts.

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=platform+bed+frame+wood+full
    • http://files.dewdropsdecor.com/uploads/1/3/0/7/130776864/6783933.pdf
    • http://files.moosemanormi.com/uploads/1/3/0/7/130740504/nejamavun_vopaleduwi_zopurikilogesa_nofoxepoma.pdf
    • http://files.zaritglassworks.com/uploads/1/3/0/9/130969340/abc28bfbd987391.pdf
    • http://files.nucec.net/uploads/1/3/0/7/130775102/d707264.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/vitezabiwomezozamedusam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8198/files/dizesejexusojivato.pdf
    • https://cdn.shopify.com/s/files/1/0428/2456/4902/files/body_parts_idioms_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/6378/5112/files/sample_letter_of_consent_to_travel_with_one_parent.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/jafuribukupefodetume.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/role_of_arab_league.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/filumofazibuguvosixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5415/files/xadeloponup.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/96744331059.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005738.bin
cacbc31dbb648adc535ce1cf615aed7a7152f651fb5d23e8cceb0938d209a0a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5738 5108 bytes
font_01_sfnt_off00006881.bin
4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6881 6148 bytes
font_02_sfnt_off00007862.bin
402e35960f264e7e83489eb1d75ca3ee1daeef08f4e31b98fac50068dc4a2df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7862 10596 bytes

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