Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40044139ac61a69…

MALICIOUS

PDF

46.8 KB Created: 2020-08-29 16:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3246cc887d352f98913f4e06af28e152 SHA-1: d50c5354cddccf9fee301b7bdf1ac299590235ab SHA-256: d40044139ac61a69fe3326b253e3c7845a53bfd9298100b8c3434cf5a0314edb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with many links pointing to Shopify domains, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/wix?keyword=the+wealthy+barber+returns', reinforcing the malicious redirector finding. The ML classifier also strongly flagged this PDF as malicious.

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=the+wealthy+barber+returns
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/fozeridivawibibigeruz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/build_max_heap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/16414491197.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/php_android_camera_barcode_scanner.pdf
    • https://static.usrfiles.com/ugd/b8c837_462a32b997ce4dbf8f8589a801444202.pdf
    • https://static.usrfiles.com/ugd/b8c837_62bcf754e168417a9c703a75dcf40362.pdf
    • https://static.usrfiles.com/ugd/b8c837_195e3f0534ea465ca49fba8be2f43f65.pdf
    • https://static.usrfiles.com/ugd/d01287_3eab1368f30d453e9bd37f68f73075c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e71e2132e20b4d69be56b8fe8620941c.pdf
    • https://static.usrfiles.com/ugd/856cea_43de77be1ae74d8aa7924525ef105b80.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/tonakigiwafidupogagimod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0457/5387/files/rubepalunifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/2018_daily_calendar_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/98284559515.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/aptitude_problems_on_profit_and_loss_with_solutions.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_off00006b96.bin
09d59e47f309cbf4aa1ae841fd8d7ed906693aca174ef7df1ee8adab6a5a99a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B96 4780 bytes
font_01_sfnt_off00007bdb.bin
f8e1792a838f99982e44f161475556307e01d0fada5e07e25fb00fb62d798904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDB 10580 bytes
font_02_sfnt_off00009ff8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF8 4324 bytes

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