Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c8d79401da4172…

MALICIOUS

PDF

54.8 KB Created: 2020-08-16 22:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5ae47d7c492e96ec7e66ccdf07ffdd6 SHA-1: 3e40009e9166e374da5554edbaa9d4fa6e7e2fba SHA-256: 13c8d79401da4172d9182c391205c5373fb1766a4bec5f181c2f87eecb686284
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself contains the primary malicious URL, 'https://ttraff.com/pify?keyword=autocad+pdf+export+margins', and numerous other links to PDF files hosted on Shopify. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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=autocad+pdf+export+margins
    • http://files.herbrainchild.com/uploads/1/3/1/3/131384589/2643787.pdf
    • http://jujuvudi.bayareabreastfeedingsupport.com/uploads/1/3/0/7/130739227/bopaf.pdf
    • http://files.codemahek.com/uploads/1/3/0/9/130969148/felukurekera-wejolanoj-jakujadu-jevibibedezenuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/nugotowojexojedud.pdf
    • https://cdn.shopify.com/s/files/1/0434/1940/2405/files/acrobat_reader_for_windows_7_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4213/6476/files/cateterismo_intermitente_limpio.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/80322983969.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/sivakuzibodawilig.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/35047510227.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/fazotowizafesovas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/makkar_ielts_speaking_2020_may.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/pigivexuzuguxegifufize.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/java_games_coding.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/the_hobbit_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/wuxujovibilasinaxufirib.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000744a.bin
22789b434dab8e396eef9c7f2cc6b11ea1c819a19ef03f094bf3d417b559f6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 3936 bytes
font_01_sfnt_off00008275.bin
0a8dc3012c35d67d114aea20be2f37d42b1ec7dbe0914dc29ebae1a0460cc859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8275 5380 bytes
font_02_sfnt_off000094ab.bin
6c308ea424d9830632e4fd0b4ffc3645e770368969c8b0cdaf847af585377c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94AB 13484 bytes
font_03_sfnt_off0000bfbe.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 4324 bytes

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