Malicious PDF — malware analysis report

Static analysis result for SHA-256 28432b3185541f71…

MALICIOUS

PDF

39.9 KB Created: 2020-08-25 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a6b11f93465645a0153092570b9420 SHA-1: 1a03b83fb31939fe3c4ff6b24ac505356a9f40fc SHA-256: 28432b3185541f71f7d6257aa22cc3c6696ddda13c9888f5ba8a1d086096469e
130 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'Calcutta university migration form 2017 pdf'. This link points to 'https://ttraff.ru/pify?keyword=calcutta+university+migration+form+2017+pdf', which is flagged as a known malicious redirector. The document also contains a large number of embedded links, many hosted on cdn.shopify.com, forming a link farm, with one specific PDF link 'https://cdn.shopify.com/s/files/1/0434/5079/4145/files/xadadafete.pdf' being part of the detected link farm.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=calcutta+university+migration+form+2017+pdf
    • http://fikat.konacoastyachts.com/uploads/1/3/1/3/131383483/9194403.pdf
    • http://files.stratfordconcertband.com/uploads/1/3/0/7/130739443/dokejirabusebos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5079/4145/files/xadadafete.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/bitlocker_performance_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4124/files/exercise_past_simple_present_perfect.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/78636831702.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/niwotoguvovukiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/bsc4success_computer.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/befemomonoxevupoboxakisog.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/equation_of_motion_by_graphical_method.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/84106583032.pdf
    • https://cdn.shopify.com/s/files/1/0434/6816/1176/files/73484440754.pdf
    • https://cdn.shopify.com/s/files/1/0437/6474/4343/files/semipulutuvune.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_off00005ba6.bin
f61dc82b5529fb6f475087867334ad60aa38215e55f1c16feb23d7da12693952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA6 5948 bytes
font_01_sfnt_off00006fed.bin
0539798a7b769b035e71ef0904971760e428f4e79e384bdbe4c42cd61a7108ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FED 10248 bytes

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