Malicious PDF — malware analysis report

Static analysis result for SHA-256 724c7ff13ec3c1c1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-07 06:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bc3d0fea73a1caa13d5e63f59d85e86 SHA-1: 3c3042d9cb2030b052c4d7fdc20917ee29385626 SHA-256: 724c7ff13ec3c1c1322c5083b584c97cb3a43d32f65199e7269587d984a2c08a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The embedded URLs suggest an attempt to direct users to malicious or SEO-farmed content, potentially as part of a phishing or spam campaign.

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=anualidades+diferidas+pdf
    • http://files.ucsdnsysusymposium.org/uploads/1/3/1/6/131607103/wojodegu.pdf
    • http://files.lighterthanairky.com/uploads/1/3/1/1/131163867/menunepepesowivagu.pdf
    • http://xemidoj.alexusbomar.com/uploads/1/3/0/7/130739415/vewizebekuja.pdf
    • http://files.dedicatedladiesconcrete.com/uploads/1/3/1/4/131483830/bimalerakil.pdf
    • http://files.buckscountypainters.com/uploads/1/3/2/6/132696029/c89ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/mazilemawuzazorimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/71384265383.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/vizolenarafojegoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/fafatabajekemozawobozuwos.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/redakapumosek.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/sogepujurusirejofoginep.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/money_banking_and_finance_bsc.pdf
    • https://cdn.shopify.com/s/files/1/0438/9103/2216/files/zufipitegemob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/macbook_pro_graphics_card.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8423/files/banufananejuremironus.pdf
    • https://cdn.shopify.com/s/files/1/0431/3474/6781/files/monster_manual_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/tobizukimuzovemufamom.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006889.bin
cc832b1e65a82d5e83e09e6818a66492377f538280d6878a97a33317c7c4d9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6889 5024 bytes
font_01_sfnt_off000079ac.bin
9b53e78744631fd910d5c66145839f5362b236cbe4abdcd93240ba395ed010f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AC 11640 bytes

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