Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe5021e92864082…

MALICIOUS

PDF

47.3 KB Created: 2020-08-10 21:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e1406a12db0385af50094b6a7a60ee4 SHA-1: 13ca3f439dd789b85be5b63d297ba200da1f7391 SHA-256: 8fe5021e9286408201d81cae328ea839a50d6919127c8a0dd8bca4d1ba648a48
120 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects through `ttraff.cc`, a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lure victims into clicking malicious URLs. The document body, though heavily obfuscated, contains text related to "bjt differential amplifier solved problems pdf" and the malicious redirector URL, reinforcing the lure.

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=bjt+differential+amplifier+solved+problems+pdf
    • http://files.ctisports.com/uploads/1/3/0/7/130739593/xidiwadetezovet.pdf
    • http://files.prideofpa.com/uploads/1/3/1/4/131406337/kolonoma_pogenerebude_tidako_vojulenujegowi.pdf
    • http://wugevipul.natmanskopf.com/uploads/1/3/0/7/130775734/kobulusawegisix.pdf
    • http://pomido.christiephotography.net/uploads/1/3/2/6/132683071/8a253.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/kovefiloxinoranuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/gibifosixokes.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/10804747015.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/tunixedogafiguxife.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/balck_berry_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/3026/5511/files/simple_past_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/kafotewonoxukabawazom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7412/4950/files/zomokamunoxusoga.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2017/files/avifauna_colombiana_ayerbe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/gemonuwamejaxirekemowole.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_off000065d2.bin
2633643daaad9e486e34ad502ead895aed5c8ae758241da912b077cd590e99cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 5512 bytes
font_01_sfnt_off00007877.bin
ce1978508d0fcc18d9821919291d8791f23fd31edd5f4168759a14ad03ebb7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 10068 bytes
font_02_sfnt_off00009af8.bin
51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF8 16088 bytes

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