Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd577bd812ef5698…

MALICIOUS

PDF

37.1 KB Created: 2020-08-12 14:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d38163e101e22e5027ba321aed481a98 SHA-1: 94cc7e0410e82d5412ba6df74a37b4dccd8800a3 SHA-256: dd577bd812ef56983ed67a58d6a5b90b7ae90b947ce71a13a6457e5cce9bd117
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=cambridge+vocabulary+for+pet+pdf+vk`. This suggests the document is designed to act as a link farm, potentially for SEO poisoning or to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=cambridge+vocabulary+for+pet+pdf+vk
    • http://pokabu.cluthaphotos.com/uploads/1/3/0/7/130775403/mamozabub.pdf
    • http://files.thenakedforge.com/uploads/1/3/2/7/132740398/nifigobusubat_xitiwuronerezo.pdf
    • http://files.fiddleheadfoods.com/uploads/1/3/0/8/130814575/sofujo-nelabidav-pimak.pdf
    • http://files.villalaurus-enluberon.net/uploads/1/3/2/7/132741476/8262869.pdf
    • http://sugav.eatmooreproduce.com/uploads/1/3/1/1/131163590/4701607.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0822/files/15320963728.pdf
    • https://cdn.shopify.com/s/files/1/0432/7184/8100/files/wusodazazojuvemulofigosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/pevumoremiveregeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/definition_of_science_fiction.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/57998676967.pdf
    • https://cdn.shopify.com/s/files/1/0429/0589/5075/files/wofuxabijokisatifunexejol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/how_hr_in_github_readme.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/zikibamelogolesibufusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/46221382849.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/sixuromanir.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/luwakege.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/diseases_related_to_carbohydrate_metabolism.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/carol_of_the_bells_score_choir.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_off00005198.bin
a5cb3dbf6bf9f2d385694d9434509bfa5fb3f3b461117f2005b2c32b48f6c136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5198 5568 bytes
font_01_sfnt_off00006489.bin
122eeee12e62771d08c99630b2db67c2d5c215f1b64d817e83964eeb3a9f1ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6489 10376 bytes

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