Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a5028dc8f17bcc…

MALICIOUS

PDF

36.4 KB Created: 2020-08-10 23:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cab2bd4f0e8881830f85a304437b5735 SHA-1: b6e40a23583fc7050094624f2a973ba830cd9e43 SHA-256: a8a5028dc8f17bccf2db17b379c840f85a1cc975ad0a6c5f2781425219d747f3
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 redirector service known for malicious activity. The document body and embedded links suggest a lure to external content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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=body+parts+diagram+pdf
    • http://files.rainsweptgame.com/uploads/1/3/1/6/131606025/vupebazenitoli-feziwegodowikip.pdf
    • http://files.sweetpotatopiedesigns.com/uploads/1/3/1/3/131380870/7882968.pdf
    • http://files.marchimeswoodturnedart.com/uploads/1/3/1/4/131406036/fasasube.pdf
    • http://files.actservices.net/uploads/1/3/2/8/132814898/7626420.pdf
    • http://files.northstaranimalcomm.com/uploads/1/3/1/3/131382470/6c6c838f6e28751.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/67934738138.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/mitetozofepad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1785/3335/files/reimei_no_arcana_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/8887/9521/files/cancer_de_mama_triple_negativo_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/4197/0583/files/availability_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/53827606177.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/vapuvawufarisatozuxoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/89266987553.pdf
    • https://cdn.shopify.com/s/files/1/0449/4472/0040/files/marketing_strategy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0745/8975/files/wajigizov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6997/files/61769386701.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/putubumijajiturem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/fazomigelubopukutedasis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000515d.bin
8471b2ad72a99da48939cd5b8c5e9a8bdeaf12d29788853bef58ac463c037869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x515D 5480 bytes
font_01_sfnt_off000063fa.bin
8c2ff2e5c1a4fe787837a4892583a7a0ad490f4da03ee24acd10a57eacb7bb91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 9532 bytes

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