Malicious PDF — malware analysis report

Static analysis result for SHA-256 99772bf5965e7d61…

MALICIOUS

PDF

50.7 KB Created: 2020-08-12 07:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f4256efeefa4d77c909e2ae0c33466f SHA-1: 31e82941dbcca8204b414d600dfc87748d6127fc SHA-256: 99772bf5965e7d61515805cf30e50f08bdefc2efc6e185fc5a63eb76a8f0b62a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to obscure the ultimate destination. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to deliver the payload. The document body, though heavily obfuscated, contains the target URL and other URLs that appear to be part of a link farm. No scripts were extracted, but the presence of the redirector and link farm strongly suggests a phishing or malware delivery attempt.

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.com/pify?keyword=chemistry+handwritten+notes+for+ssc+cgl+pdf+in+english
    • http://files.sharingeducationlearningforlife.org/uploads/1/3/0/9/130969656/9a3dbef.pdf
    • http://files.patotoole.co.uk/uploads/1/3/2/8/132816195/rewapu.pdf
    • http://files.kemslashes.com/uploads/1/3/2/6/132682899/kuzadifa-tawususipirojor.pdf
    • http://files.ernst-arch.com/uploads/1/3/1/3/131398022/vukeri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9537/5524/files/o_que__cultura_popular_editora_brasiliense.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/ruvilibeluzopovefov.pdf
    • https://cdn.shopify.com/s/files/1/0449/8967/7736/files/anlage_sv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/sabadiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/80912466775.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/linowilarodubonatawifime.pdf
    • https://cdn.shopify.com/s/files/1/0446/9496/2332/files/25_branches_of_biology.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4838/files/jiwanageguvukoto.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/modern_business_process_automation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/satefuzejejufum.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_off00006ca8.bin
f49e713378f7fdd6fe390a374ea5b5f9ad16adcbdb556438d2dd2d756b7f869e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 5668 bytes
font_01_sfnt_off00007fe2.bin
6a817b8c31a5a30322ba93ff069722033535b7aedc25c0028c665dd46697a796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE2 14728 bytes
font_02_sfnt_off0000ada1.bin
5dacd336e1a9c0e19b9b9beefe62f6a87dcdff0d9619d193b3a04017abaec374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 4120 bytes

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