Malicious PDF — malware analysis report

Static analysis result for SHA-256 5954fb659f1a6463…

MALICIOUS

PDF

40.2 KB Created: 2020-08-09 23:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb641b5be9c61595f35c8558f8e2968c SHA-1: 4359e5cee30a8a08cc0a0e2ffc3ff4ca9bdea8ae SHA-256: 5954fb659f1a6463418d53c54393718570834be2dc4c24ddca1647bf8e24d1a9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body text, though garbled, contains keywords related to embedding PDF files in Word, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.ru/pify?keyword=insert+pdf+file+as+icon+in+word
    • http://files.mountainblueharmony.com/uploads/1/3/0/7/130776786/vetig_xalab.pdf
    • http://files.buybishop.com/uploads/1/3/0/7/130740213/xifavaxa.pdf
    • http://pulefiz.kitsapfamilylc.com/uploads/1/3/0/8/130814328/3453325.pdf
    • http://files.theartfulclarke.com/uploads/1/3/1/4/131407315/nopafun.pdf
    • http://files.scvpta.org/uploads/1/3/1/1/131163540/tomoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/brown_bear_story.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/kusuruzowalawolalewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/44308264443.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizazuvolabemonixodokij.pdf
    • https://cdn.shopify.com/s/files/1/0440/9645/4808/files/nunamibubalavumorilen.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/copious_dogs_mod_1._7_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/encyclopedie_bricolage_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/podizigadumiderevopogipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/riputakumajido.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3593/files/dinikok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/mafipusuxudulepibiker.pdf
    • https://cdn.shopify.com/s/files/1/0437/2601/2567/files/the_scorch_trials_movie_times.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_off0000626b.bin
76cd9a9986f85f5531189a7ed7ed2ab15714693e349642178bfba24000af4d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 5176 bytes
font_01_sfnt_off00007429.bin
48fad665be435397b2549f9c436ec7da3a10e643a743a36d132d6f3f1ee8d74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 9348 bytes

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