Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eb964c5a3ae9d7…

MALICIOUS

PDF

49.0 KB Created: 2020-08-19 05:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1860260e3a65df086a06c3449883b824 SHA-1: 5f207be6c5577f0f0361f5380be53115eced4f61 SHA-256: 73eb964c5a3ae9d71661292188c52e908e63443eed12d2291176568ffbebc4f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates that a link redirects to known malicious infrastructure via 'ttraff.cc'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the string 'sheet metal gauge chart australia' and a URL, suggesting a lure 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.cc/pify?keyword=sheet+metal+gauge+chart+australia
    • http://files.therisingstars.co.uk/uploads/1/3/1/4/131452887/fezajufa.pdf
    • http://files.megan-livingston.com/uploads/1/3/1/1/131163841/9847614.pdf
    • http://files.dabesthawaii.com/uploads/1/3/0/7/130775393/werevofimejerurila.pdf
    • http://likud.imsarc.net/uploads/1/3/0/8/130874655/0054aac1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/objectives_of_budgetary_control.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1097/files/standard_sata_ahci_controller_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5352/files/bobol.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/hierarchy_of_needs_by_abraham_maslow.pdf
    • https://cdn.shopify.com/s/files/1/0447/7508/0087/files/51711566468.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/parliamentary_debate_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedepisolutiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/14206394844.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/18911370366.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/72003112366.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000755e.bin
fc5605f03651afe02607165185c4faae63a3ba4e1949a255d8a7f7ec73a1de1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 4980 bytes
font_01_sfnt_off00008644.bin
59fa49802423cfe2d533c6f10ce027aaee4de4ac72cbf535173f84d5857cb5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 10236 bytes
font_02_sfnt_off0000a91f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91F 4324 bytes

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