Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b3cb52ea32d2e2…

MALICIOUS

PDF

47.4 KB Created: 2020-07-30 17:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc8bafafff2c6f79c772d314b71caab6 SHA-1: 80dcc849d75d1dc1308cf059bb5c789f62ba6a24 SHA-256: c1b3cb52ea32d2e27da5872a344123d3e7ff8dd8b3510f85496e9c202770fe9a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to mimic a book title, suggesting a lure. The presence of a PDF link farm heuristic further indicates malicious intent, likely to drive traffic to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=barron+s+ap+psychology+book+pdf
    • http://files.gwrra-iowa.com/uploads/1/3/1/3/131380849/zuwejasadiwer.pdf
    • http://files.awakenemerge.com/uploads/1/3/1/4/131453249/950f928b2.pdf
    • http://files.spanish.thelanguagehub.net/uploads/1/3/0/7/130740465/1497352.pdf
    • http://files.focused-fitness.com/uploads/1/3/0/8/130873708/novuxaforisosa_zukovagaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/45083310128.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/vorebap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/juboxafaduduba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fexofedome.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/77084380157.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/wabaxani.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/10911506315.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/garamadekazigipiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/33724959121.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/89510090967.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.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_off00007b7c.bin
972859a951288654f9026364c5c4b89bf856f93973369fb81ba60cdd9b58f1ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 5316 bytes
font_01_sfnt_off00008d76.bin
07e18926d0741eefabf37a9edcd3d5943dbe128be8554c21ce536f775ffe5367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D76 10488 bytes

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