Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a451632fc22717c…

MALICIOUS

PDF

47.9 KB Created: 2020-08-22 02:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2faeaae64fc0fa48ec78c544e3d18ec1 SHA-1: 8207e48d0af9d1fa3479a2558e846dc0a2689907 SHA-256: 3a451632fc22717cb29ae9343614783353faf0752b91c8946fe6dcecd22193d5
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a known malicious redirector (ttraff.ru). The document body is heavily obfuscated, but the presence of the malicious redirector URL and the heuristic firings strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

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=uk+biodiversity+action+plan+pdf
    • http://files.cassbands.org/uploads/1/3/2/8/132815388/5462706.pdf
    • http://files.riversidecarriagecompany.com/uploads/1/3/0/7/130775062/tutemijo_janulezakeguw_diselasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/namumilobub.pdf
    • https://cdn.shopify.com/s/files/1/0464/5152/3752/files/assault_android_cactus_xbox_one_multiplayer.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/descubre_1_leccion_1_contextos_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8024/4643/files/jukukaferur.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/39595666572.pdf
    • https://cdn.shopify.com/s/files/1/0461/8292/4441/files/catholic_bible_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/2019_bollywood_new_movies_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/30420802003.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_off00007e64.bin
d87d165c166fa2710fd5c7c17375f330a3ed95dac0ce5d0f549b147a150b3eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E64 5508 bytes
font_01_sfnt_off00009137.bin
3ae78a7b4cae01061d6afec5f7ffbd415209e2aa78e52b09c7c44343ec6ae80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9137 9988 bytes

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