Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a3ea136bdeb04d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-15 05:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72af68f4c59420a4044cd0560ea2d14 SHA-1: 8a14ca6f074353e0306e9e98b8afd740f8d377ba SHA-256: 78a3ea136bdeb04dc5d5bd7e3bdf8e71d3abd7c2b48b584366eb1bf6d26c79c9
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though corrupted, contains text suggesting it is a lure for 'cost and management accounting lecture notes pdf'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=cost%20and%20management%20accounting%20lecture%20notes%20pdf
    • http://livemofi.westportom.com/uploads/1/3/1/3/131398104/xekotefezi-kolubegudilib.pdf
    • http://files.apwcsa.ca/uploads/1/3/2/6/132696500/5071624.pdf
    • http://files.firstcovenantsuperior.org/uploads/1/3/1/6/131606640/vovutunapejedidure.pdf
    • http://files.michellevaske.com/uploads/1/3/1/3/131384468/e0a6ec.pdf
    • http://files.rioranchoco.com/uploads/1/3/1/4/131437702/sewagiju.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/equivalent_fractions_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/vewisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/68512954281.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/completing_the_square_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/71082784400.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/xotogotekikuxosexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/86925073873.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/18869741254.pdf
    • https://cdn.shopify.com/s/files/1/0438/3784/9762/files/muvamipejanomanip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/55548232382.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/35446969202.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_off00005e15.bin
5c0284105b6b43ad29b4691f12e8c45595d6e72c7156fe11dcf245454a8eaea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 5380 bytes
font_01_sfnt_off00007042.bin
682ca381e5ee4e7bb205c50f193180be4889065962545592274538fb105ca74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 9736 bytes
font_02_sfnt_off00009182.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9182 4324 bytes

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