Malicious PDF — malware analysis report

Static analysis result for SHA-256 267797a4b6a84166…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 01:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368186d60968f0c4e56f9215ef7c2487 SHA-1: 3948f51681cadc24dc6296d70f028d6ad827132f SHA-256: 267797a4b6a84166968a60d113d864ad1d07844e966b1a708d427adfad5b920b
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which is a common technique for distributing malware or phishing pages. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=differential+equations+boyce+10th+edition+pdf as malicious. The document body, though heavily obfuscated, contains references to the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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=differential+equations+boyce+10th+edition+pdf
    • http://rovatofe.cynthiastarrheartspeak.com/uploads/1/3/2/6/132695384/memijesonalu_rulozisegiwopa_suropavixale_jewegesomegog.pdf
    • http://files.trinitylutheranpreschooldarmstadt.com/uploads/1/3/0/9/130969037/5074939.pdf
    • http://files.westhampsteadchristmasmarket.co.uk/uploads/1/3/2/3/132303118/dc4886dadfb812.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/vizududomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/fovorebelevekukobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1294/8121/files/29916348344.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/51986041097.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/5893574088.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/jukoxupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/janopazoziruvagikamofoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/pilexutilumugowumavori.pdf
    • https://cdn.shopify.com/s/files/1/0430/6812/9431/files/87765019363.pdf
    • https://cdn.shopify.com/s/files/1/0428/5772/6118/files/sitakedinidujoxuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/30378426764.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000658e.bin
a4ed0b378eaedb4829872b2fc82879afedd3f3cb5d18f8e0fbd2330b77fda568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 5804 bytes
font_01_sfnt_off00007958.bin
4a40902665f2eb48301dedefaffa392f7d9e0e30d8c40b68a70fad4b877b05d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7958 10180 bytes

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