Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfea92ed36ee271…

MALICIOUS

PDF

63.7 KB Created: 2020-09-01 01:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c616256f689d0be56461c11dd7f081cf SHA-1: 029218453a70f9872f6dd503534edfefd0513c5f SHA-256: dbfea92ed36ee27160c622bf7992b0e334a79ce0fbcc2966a472492747995012
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://ttraff.com/pify?keyword=hbr+after+action+review+pdf', is likely used to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure and embedded URL are sufficient to infer a phishing or redirection attack.

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=hbr+after+action+review+pdf
    • https://static.usrfiles.com/ugd/b6edda_812011959d0240ac8e918f210c165f11.pdf
    • https://static.usrfiles.com/ugd/cc089a_4c26559e09b946a788da30d33330fed5.pdf
    • https://static.usrfiles.com/ugd/b7306e_8494bb3725af4e5aa4c1c1fda57bbddb.pdf
    • https://static.usrfiles.com/ugd/1849a1_8ae0acf1617c40e8bbf885f92f8d70ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_aab825ff2fb34a37ba86aa171f4281d2.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/73307270862.pdf
    • https://cdn.shopify.com/s/files/1/0469/4943/3505/files/anlodipino_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2714/files/rulatakizesaneruxotimedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/cricket_rules_and_regulations_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0435/2806/1087/files/jejurekazojo.pdf
    • https://cdn.shopify.com/s/files/1/0458/0373/3158/files/xavafije.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/99366095498.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/95428263344.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/cardiorespiratory_physiotherapy_adults_and_paediatrics_5th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/super_mario_bros_disassembly.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/josinefinopave.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_off0000bb8a.bin
536810847766e77448a32bf7ae5bf938f1f86651dff31f309a73917b09e47565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 5192 bytes
font_01_sfnt_off0000cd55.bin
29d2026433e8e2521a2331139922113f3a1650b948cf103f8107e3c28b1dfa3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 10940 bytes

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