Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b0b8a10b3916c4…

MALICIOUS

PDF

60.8 KB Created: 2020-08-28 17:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef2ef8096cd8d7f9242dc1a84585bb7b SHA-1: a51eb4f13c072b2f2795d62dbe17db7457c6c765 SHA-256: d5b0b8a10b3916c400247f5f5e0a785aebe500087ba109265d1e05dd820e6563
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains numerous embedded links, many pointing to external PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=reinforcement+learning+sutton+2018. The document body contains garbled text but also includes the same malicious URL and several other URLs hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. The primary intent appears to be directing users to malicious or SEO-abused 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.ru/pify?keyword=reinforcement+learning+sutton+2018
    • http://wizuxeko.softwareacademy.co.uk/uploads/1/3/0/7/130776078/7386666.pdf
    • http://files.nywomenofpurpose.org/uploads/1/3/2/6/132681558/zopuxulowo.pdf
    • http://tezibu.insurancesolutions4all.com/uploads/1/3/2/7/132741555/aeb1c0a4dfd4.pdf
    • http://zofuzuzal.fudosanbunka.com/uploads/1/3/1/4/131407668/2162230.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/lejividoxarirezigef.pdf
    • https://cdn.shopify.com/s/files/1/0462/3869/5573/files/mapamundi_con_division_politica_sin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8392/files/business_plan_proposal_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/9958444586.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/how_to_delete_all_messages_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/55453372900.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6642/files/4798909947.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/97875653207.pdf
    • https://cdn.shopify.com/s/files/1/0428/7021/0716/files/manageengine_application_manager_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/6080/3237/files/aetiology_of_hysteria.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2954/files/35517954343.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_off0000a20a.bin
59201149c39d5d6691af8afbfc8090c55cf4ed1ea9b5d10198e05fb38224e0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA20A 5608 bytes
font_01_sfnt_off0000b503.bin
152cdef611e4374908f9cbd5961d01485a42e8da4a37d9dfb59b1bc90fdd6b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 10348 bytes
font_02_sfnt_off0000d846.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 4324 bytes

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