Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06489c7647dd895…

MALICIOUS

PDF

45.1 KB Created: 2020-08-30 15:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a05d7f7d81cb6b27b7e01d050384672 SHA-1: f0d48f82ad2116dc45ea3f7dcca81c335a6b479d SHA-256: d06489c7647dd895ca53adec7cd3aebac9fa5a6a1cb0f812d09813aac83fc829
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users to malicious sites. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a social engineering attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector is a high-confidence indicator of malicious intent.

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/wix?keyword=determiners+and+quantifiers+exercise
    • https://static.usrfiles.com/ugd/b8c837_1b71d75ab8ef4596b2a344b295b1484e.pdf
    • https://static.usrfiles.com/ugd/08fe48_a71645f027aa4115b9c29a9245836e35.pdf
    • https://static.usrfiles.com/ugd/516793_6836284acfa24acda4c76d805aba3e93.pdf
    • https://static.usrfiles.com/ugd/de3d83_d14a8c9be91341598b584c9ec4404494.pdf
    • https://static.usrfiles.com/ugd/5be868_6adf1c9b704d4993b6cca33eae20adae.pdf
    • https://cdn.shopify.com/s/files/1/0461/1617/6036/files/background_music_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/free_english_urdu_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/parogul.pdf
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/buss_perry_aggression_questionnaire_bpaq.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22537170944.pdf
    • https://static.usrfiles.com/ugd/7c30af_ca04c002137448028c28a56bb941d482.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_3c3e59c4d1754e9fbcc31f87cf9f4859.pdf
    • https://static.usrfiles.com/ugd/cfa91a_5c5c7e630bf842e7987baed1b64a03e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_377c94258a5f403998d57114d9890b01.pdf
    • https://static.usrfiles.com/ugd/8ab72e_980a0c5fcfe44c7191923bbb86edb5d5.pdf
    • https://static.usrfiles.com/ugd/930050_4a61cb9c2caf422e8a9fcbe7c834b637.pdf
    • https://static.usrfiles.com/ugd/b8c837_189118df973d460ebb9913db856bfb47.pdf
    • https://static.usrfiles.com/ugd/e5a943_51d0a743efd44eb3a44880fbe3aaf787.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_off00007340.bin
d684dfbc9ee09eec7fa46c933b6d6e0dfa64daf538a9ae37ca5781d8856f952e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7340 5328 bytes
font_01_sfnt_off00008540.bin
94f845916a70c23047907d739cc8b504ace3d549d39ddc5906f964c258ca9558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8540 10008 bytes

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