Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a90d0bdf4755e9f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 04:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 734df5020924d09622d76a66b4ea5a5b SHA-1: 49920f5dbca7c37220e32580db9bd17f1b46a092 SHA-256: 1a90d0bdf4755e9ff9acb6785ed2b9c55b79f24e162799fa9df1b0a312904c44
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'calorie counting app android' and the redirector URL also includes this keyword, suggesting a lure. The primary heuristic indicates the PDF links to malicious redirector infrastructure, and another heuristic identifies it as a link farm. The embedded URLs are likely used to distribute further malicious content or phishing pages.

Heuristics 3

  • 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.
  • 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/pify?keyword=calorie+counting+app+android
    • http://xudip.sherriobermark.com/uploads/1/3/1/4/131438111/7669385.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/xafasemales.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/2002_saturn_sl1_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/0090/3318/files/45635377606.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3605/files/6132891295.pdf
    • https://cdn.shopify.com/s/files/1/0434/7651/7014/files/10626999647.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1189/files/warlock_rogue_5e.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/xodubagilasowuzilinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4426/6399/files/72033015152.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/naming_ionic_compounds_worksheet_answers_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6175/files/kapaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/48095385344.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_off00006c16.bin
196be3a885db95efce8abc65bd3c9a0a679bbfbddab51d311fa78454cd92447f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C16 4968 bytes
font_01_sfnt_off00007d08.bin
b63315c8cf7533fd89d4439460340b4ed512040009f9362461d5d1b19e146fac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D08 9868 bytes

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