Malicious PDF — malware analysis report

Static analysis result for SHA-256 8912b30f4ac314a9…

MALICIOUS

PDF

62.0 KB Created: 2020-08-25 03:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331f829ba225c6bd086a6d0cdbcab126 SHA-1: 900df0ad6b9bb867eed4e1e298a3e188e300a74b SHA-256: 8912b30f4ac314a90732a30f37cc2913eda7d1b4fadf93a3e527f8a9c4830d33
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure victims with promises of "Autocad online exam questions and answers". The primary link directs to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the document body and heuristics clearly point to a redirection-based 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=autocad+online+exam+questions+and+answers
    • http://bijolo.bckennelclub.org/uploads/1/3/2/8/132816066/1ca920852.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8181/files/18923196421.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/51989318064.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/93561225371.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/kitchen_cabinets_standard_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/21445422629.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/bony_to_beastly_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/aditivos_alimenticios.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/14357921396.pdf
    • https://cdn.shopify.com/s/files/1/0451/7330/9589/files/23306663520.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/dikoneniwavisovulogoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2070/4150/files/ce_technical_file_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/71212028188.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4780/files/bachelard_biografia.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d6b.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6B 2828 bytes
font_01_sfnt_off0000a766.bin
e281bac5e3ac01c2e96ada04fae229dacc110e968429004ecf8a8d5ff75f4cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA766 5240 bytes
font_02_sfnt_off0000b926.bin
ffb7d1540e58f2aa6440891358a918e63e196f9dfbe14122d2ba0054599c95ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 10440 bytes
font_03_sfnt_off0000dcb0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 4324 bytes

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