Malicious PDF — malware analysis report

Static analysis result for SHA-256 91adc4b7ee5968cc…

MALICIOUS

PDF

44.0 KB Created: 2020-08-22 10:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1661191b94640287551e78f93df070bc SHA-1: 03650e7c7f65ca6c3b72260b0d58abc9ba666c92 SHA-256: 91adc4b7ee5968cc6b883ed8bb5a73a357019e9dd329a9f465ff6ce3fd2be51c
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a seemingly innocuous title related to a movie, but the embedded links, particularly the one to 'ttraff.com', are indicative of a redirection scheme. The presence of numerous links to shopify.com PDFs, some of which are benign, alongside suspicious domains, suggests an attempt to obscure the malicious destination.

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=chhattisgarhi+movie+mor+chaiya+bhuiya
    • http://terake.militaryhistorylive.co.uk/uploads/1/3/0/7/130738731/satojo-domatuf-zopukus-xopuwupom.pdf
    • http://files.headandneckultrasound.com/uploads/1/3/1/3/131398292/mazopuwawedidu-pinedivozo-repuzene-daruf.pdf
    • http://rawime.sheepprogram.com/uploads/1/3/0/7/130776334/1322385.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/92794121955.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1077/files/dusuworajanezizivoseku.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/edema_grading.pdf
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/25120922524.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/bixixuvomenegadipasub.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/tinapava.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/dictionary_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/educational_vocational_guidance.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69651331918.pdf
    • https://cdn.shopify.com/s/files/1/0433/4655/9127/files/hashtable_java_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/how_to_edit_file_free_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/candle_making_books.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006050.bin
0548be9e32fff5111920b3b585d3426398526d8eae027e66d6fa2802be41fc18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 5388 bytes
font_01_sfnt_off0000728e.bin
fb8141519f4678e10002d8be6147bffc8964bfa997f19adf47e3c367da475270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 10088 bytes
font_02_sfnt_off0000954e.bin
e710fbc454ae5325cb3d36e20b5ac89a3b70e97766c28e5505111898d21b9d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x954E 3456 bytes

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