Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f0134037ea3d48…

MALICIOUS

PDF

45.0 KB Created: 2020-08-13 22:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2fee8007afb85b7fb9cd1bbd046fe27 SHA-1: d127ee01a3644c809b9575ffdf1d6b6308fcdfa8 SHA-256: 91f0134037ea3d48f2eeb004a04d5298a4d993317e418d5be28be3ce5c9536cd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary redirector URL being https://ttraff.cc/pify?keyword=book+of+mormon+japanese+pdf. This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the extensive link farm points to a delivery mechanism for further malicious payloads.

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.cc/pify?keyword=book+of+mormon+japanese+pdf
    • http://files.onelightinstitute.org/uploads/1/3/2/6/132695746/vixiwaxopitime-sopojirowor-tirulunonowog-vugupifutamu.pdf
    • http://files.portellowinecafe.com/uploads/1/3/1/4/131408250/zitog-xotoj-tivatiguxivev.pdf
    • http://files.bluecornconsultingllc.com/uploads/1/3/1/1/131164308/witefed.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/xapuwanabeta.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6754/files/1491938484.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jojanasesejunuveko.pdf
    • https://cdn.shopify.com/s/files/1/0439/6033/6542/files/87292628056.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/putolunibimewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/12233942098.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/dadul.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/dezoxetazipaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/3050982795.pdf
    • https://cdn.shopify.com/s/files/1/0450/6717/4040/files/aerodynamics_car_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/triola_elementary_statistics_12th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.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_off00006551.bin
361261355c07198336062497a3a37a1e5694eb7624238b7824951141d867fdb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6551 5004 bytes
font_01_sfnt_off00007635.bin
62d5cc27d3b7651e694b676347997e4185cc213dff1a8602263c30e4199e1bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7635 10100 bytes
font_02_sfnt_off00009898.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9898 4324 bytes

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