Malicious PDF — malware analysis report

Static analysis result for SHA-256 b558baead5213880…

MALICIOUS

PDF

41.2 KB Created: 2020-08-11 19:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b4522fddcf4df1a1938dc70e7faf262 SHA-1: 70b3040eaa5d7f3a04ffe550c3456c8bc39ddc22 SHA-256: b558baead5213880d221be6e5278c3b5af2e55d3df713ab485eb6cffd5758a4c
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.ru, under the guise of providing interview questions. This heuristic, combined with the presence of numerous other external PDF links, suggests a link farm or redirection attack. The document body, though partially corrupted, contains text related to interview questions and the malicious 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.ru/pify?keyword=interview+questions+for+teachers+pdf
    • http://files.waitakaruruschool.com/uploads/1/3/1/4/131408572/4338738.pdf
    • http://files.thispawsomelife.com/uploads/1/3/0/7/130775462/nekaz_bugajuw.pdf
    • http://votibip.davidtaylorphotographer.com/uploads/1/3/1/4/131407241/9c257.pdf
    • http://files.sideofsweat.com/uploads/1/3/2/3/132302940/6336359.pdf
    • http://files.pureheartbody.com/uploads/1/3/1/6/131607029/2da94a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/english_grammar_rules_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/6934/9794/files/9782155759.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/walej.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/88740966282.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35543542817.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/51693539735.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4884/files/wugakaxigudekiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2110/files/juforinakana.pdf
    • https://cdn.shopify.com/s/files/1/0429/2342/5955/files/teteregusedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/xefut.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/nogurigezox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/zujopod.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/96669285863.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_off0000639f.bin
672f3138ba1e96e199a6f80b227d1ba5c6e3f580d26d1a0ffbaa907cab0230c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 5424 bytes
font_01_sfnt_off0000761d.bin
dab83793de6d97d0bcd306b74984331a0f7da4d731b39511ae819519acfc1651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 9904 bytes

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