Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed23eb25675870ee…

MALICIOUS

PDF

46.5 KB Created: 2020-08-05 05:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f616f020ba496518b81308d9997a4d1d SHA-1: 2074f7bb5d01eb5b69771749f660a6501dc56e45 SHA-256: ed23eb25675870eedc02674c456fed715c759fea1e6a6901c6d71620dfd9ade1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains this same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary malicious redirector is clear. 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=neural+network+example+problem+pdf
    • http://files.lahcarchitecture.com/uploads/1/3/0/8/130874598/sudawamolusinozapo.pdf
    • http://files.praxiscoffee.com/uploads/1/3/0/7/130775902/8b525b72bedc9fc.pdf
    • http://viguvopa.senoramoore.com/uploads/1/3/0/8/130874218/zusata_logedubixadikaz_madifodusuresi_kewon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6681/8721/files/69803772171.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/filararerovexenujavilalo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/the_boy_who_cried_wolf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/lagisefevabanagibalawaven.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/marketing_communication_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/vatewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/lutedoxutaketegox.pdf
    • https://cdn.shopify.com/s/files/1/0438/1802/5122/files/26300235796.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/vodusonimudi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/loxatagete.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/86610203793.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/49514535604.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_off00006aa0.bin
ec38252ff09e339ce87cdb59c5a4579cd97978b65d272d98ef51f844d2a474d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA0 5176 bytes
font_01_sfnt_off00007c38.bin
8117a3a0781643506d0f7d993fec3ad28d471372f6f6417c9678406593e4e5a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 10208 bytes
font_02_sfnt_off00009f1d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1D 4324 bytes

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