Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df08799c8bc077d…

MALICIOUS

PDF

40.2 KB Created: 2020-08-04 23:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f0bfef849e4ac41e2b0c21764c1e64 SHA-1: 8611a31c60531586f9c42ce38ce73be49e234456 SHA-256: 4df08799c8bc077d85ff074f75832746aac8453ff512ecf8b1faa9499bfe18d4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to benign Shopify URLs, but also includes a critical link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same malicious URL and benign URLs, suggesting an attempt to disguise malicious activity through SEO poisoning or a phishing lure. The ML classifier 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=mcgraw+hill+ryerson+grade+11+chemistry+textbook+pdf
    • http://files.ristorantepizzeriacasamatta.com/uploads/1/3/1/3/131383771/7423539295.pdf
    • http://files.gosforddistrictmotorcycleclub.org/uploads/1/3/0/8/130815095/zenatoru.pdf
    • http://files.chessnortherncape.com/uploads/1/3/1/4/131438464/nefanar.pdf
    • http://files.carolinebanksactor.com/uploads/1/3/0/9/130969614/xorexedidawabig-sukuxanuzutum.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/bcs_business_analysis_foundation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/78818754530.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/84405438472.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/jalojufosopes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/50248221255.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/55716253504.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/buvamesedisejosodiseromer.pdf
    • https://cdn.shopify.com/s/files/1/0430/5567/7591/files/97134973870.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0730/files/48475501287.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/vunojipowedelipo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/terosozopov.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/58464351596.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/sinufaji.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_off0000580b.bin
544266fb24a930eb990003630576a806af70ee451457a36bcceb4d99319e307c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580B 6092 bytes
font_01_sfnt_off00006cc8.bin
ab9493dff12c57b8b7e990c4e6b414e4028a4f42143d03a85d15cf940750ca85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 10776 bytes

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