Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54115834a57a6e4…

MALICIOUS

PDF

39.5 KB Created: 2020-08-21 08:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e141bd2d07418a901ee9d4bebdc32242 SHA-1: 4d1e48751a4c11d443118d6aeffd3b07577a96de SHA-256: b54115834a57a6e444053dfe377d9c85f9d5a7659650e1ffb5932fc482ba64e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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.ru/pify?keyword=cerfa+permis+de+construire+pdf
    • http://rubodet.mowaxdiscography.com/uploads/1/3/1/4/131437709/febumibidokubiz_gogepuler_jarewepa_pomapoji.pdf
    • http://rutidojus.letmommyread.com/uploads/1/3/1/4/131408899/senivovugativ_zitibomusibabit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/dobabedurozamegebapima.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/45936180972.pdf
    • https://cdn.shopify.com/s/files/1/0436/0853/9299/files/spectrum_math_grade_6_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/hebrew_english_transliterated_bible.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/rubezegegax.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/moromixizusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/zikegakuzosegol.pdf
    • https://cdn.shopify.com/s/files/1/0447/1911/2345/files/the_bartender_s_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/sidadevanuxen.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_off00005c6c.bin
a179b44ce9715b6394fafab59da205c42f37cbfcf617a865de2e763f1da2abc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6C 5172 bytes
font_01_sfnt_off00006de5.bin
8b7182029e150d192996acde217f82b26791047057c6624e9967046cfbebb4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 11416 bytes

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