Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ce09bc6be50191…

MALICIOUS

PDF

44.2 KB Created: 2020-08-14 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d66ee603c9d74e39b43e2f1ecab5cfa6 SHA-1: 7684f816600e7f8096df86d2fe9a52a04fae9b96 SHA-256: 37ce09bc6be501912f45fa41298e429ab572842d8f6863f31f1309bcbd24ba37
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to other sites. The primary redirector URL is https://ttraff.ru/pify?keyword=androscoggin+river+fishing+guides. This technique is commonly used to obscure the final malicious destination and distribute malware or conduct phishing attacks. No scripts were extracted, but the extensive link farm strongly indicates a malicious intent.

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=androscoggin+river+fishing+guides
    • http://terop.baiadc.org/uploads/1/3/1/8/131857631/6039399.pdf
    • http://files.awakeningtoyes.com/uploads/1/3/1/4/131411474/2306952.pdf
    • http://files.seymourwildlife.com/uploads/1/3/1/3/131398008/kasotip-novikosevinu-zosemaxod-videxupabegel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/4204701297.pdf
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/enterprise_risk_management_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0429/4544/6044/files/62613202567.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/understanding_public_policy_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/grenoble_tourist_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/51558172818.pdf
    • https://cdn.shopify.com/s/files/1/0434/6747/3046/files/ank_c3_bcndigung_d_kommens.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/88113275164.pdf
    • https://cdn.shopify.com/s/files/1/0446/6016/2713/files/glossaire_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/60731657547.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/tojomakubelaref.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/zunerakifov.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_off0000625a.bin
edee8630204731edc2deb240a5c87b74368125e3456d32447f54cf9e0e43dd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 4892 bytes
font_01_sfnt_off000072f5.bin
02512adc3202ea790553e2bb34031ea4c67ccfcd4e507e16e872f41bc0360e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 10176 bytes
font_02_sfnt_off000095a6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A6 4324 bytes

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