Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f3c26120f69d0e…

MALICIOUS

PDF

62.2 KB Created: 2020-08-15 10:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc63ca0fe890eeb8c773809a180a98f6 SHA-1: 8c116d6064e3deec2922b58b7a70fb5013c7804c SHA-256: 61f3c26120f69d0e86cd3a8eb841938fa8767f777e5b1a696514d6cff928d224
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.cc/wb?keyword=pig%20fat%20code%20pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, indicating an attempt to direct users to a malicious site, likely for further exploitation or phishing.

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/wb?keyword=pig%20fat%20code%20pdf
    • http://files.noahsacksteder.com/uploads/1/3/0/7/130738859/2d2fc.pdf
    • http://files.amandajbarker.com/uploads/1/3/1/0/131069910/filefenejibi_setorivibinef_novagizawepun.pdf
    • http://towedi.concepts2realities.com/uploads/1/3/0/9/130968931/dde5597077335c5.pdf
    • http://files.alliedherstesting.com/uploads/1/3/1/8/131856279/napesekimabo.pdf
    • http://jivajuja.fhpsc.ca/uploads/1/3/0/8/130813612/tomitazukufere-mejosevuko-nubefo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/kijadadudaburugiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/mukotovawojifojoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/39757330048.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/dutotunufabasiwewitotuma.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6599/files/canzoniere_scout.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/tosesosozajatowoluvali.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/tebizumimividugora.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3383/files/5466291413.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/gibixubezekoluxabipejut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/wufusube.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/nitefetosogajelowu.pdf
    • https://cdn.shopify.com/s/files/1/0452/5057/6541/files/bazefinigalumilina.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/nulobigemenibipubaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/ranaboverekog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009dff.bin
61537a75070eed5458414124025aae0e9b0c3fadd0b96a2949a997192acd8a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFF 4700 bytes
font_01_sfnt_off0000ae03.bin
21f353775a44ac848ff80fff6681e9eee4b30a663a2504f1e46ef87d5f006cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE03 15416 bytes
font_02_sfnt_off0000dd64.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 4324 bytes

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