Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b3b520eb398b9d…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 04:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2acefad675cb9203cc0a0488b02e9132 SHA-1: 337310eb6b050963fa80fe269d4ff3f61f877bee SHA-256: 13b3b520eb398b9daf00cfa409ac99e514f4f85dab36e440300aef023fd0516c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and heuristics indicating it is a redirector link and a link farm. The document body contains a URL that points to known malicious redirector infrastructure, likely used to lure victims into visiting malicious sites. The presence of numerous external links suggests an attempt to manipulate search engine results or distribute spam content.

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/wix?keyword=ayer+la+vi+don+omar+wikipedia
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8271/files/vakuwewovupukugatukomiwan.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/nexoxufaref.pdf
    • https://cdn.shopify.com/s/files/1/0465/5421/8646/files/excepciones_de_la_regla_del_octeto_p.pdf
    • https://static.usrfiles.com/ugd/a298ce_8fb07422f3364102a29bbc3188f8c299.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd09c383339a480bb46b21b5c0a4a224.pdf
    • https://static.usrfiles.com/ugd/e5412a_96ef83fb9ce8460587204d662a47d398.pdf
    • https://static.usrfiles.com/ugd/f459ea_5ddbc89960b546f5bab61c59abca2ddf.pdf
    • https://cdn.shopify.com/s/files/1/0464/8465/2184/files/cabinet_ministers_of_karnataka_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/55319377085.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/test_para_detectar_autismo_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6230/files/case_interview_frameworks.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/trx_beginner_workout.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/34925375508.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_off00007c5b.bin
03da9f021334fa98892b423bc977e7d017e1e6f1348a6b4e920b556a8b47fed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5B 4940 bytes
font_01_sfnt_off00008d1a.bin
008bf97196f6c5a451ec3ea44acb2b549eb9dd3a6fd713f3d3aa2079dc112b34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1A 10620 bytes
font_02_sfnt_off0000b13d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB13D 4324 bytes

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