Malicious PDF — malware analysis report

Static analysis result for SHA-256 a392a7d9f4e36779…

MALICIOUS

PDF

32.2 KB Created: 2020-08-08 05:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd69f0b10767e6f7785215b1797c8d21 SHA-1: 28876e667bbeef3ef4e2f158be0ea020455af663 SHA-256: a392a7d9f4e36779457a9bf634642bcb63292a01f2c203e268ea06e684abf679
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=cambridge+checkpoint+english+student+book+1+answers+pdf'. The document body, though heavily obfuscated, contains text related to educational material, likely serving as a lure. The presence of numerous external links, including the malicious redirector, indicates an attempt to drive traffic to potentially harmful sites.

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.com/pify?keyword=cambridge+checkpoint+english+student+book+1+answers+pdf
    • http://gusejusu.twohappyhedgehogs.com/uploads/1/3/1/1/131163635/zegadivavepen.pdf
    • http://files.vanderlegal.com/uploads/1/3/2/6/132682627/cb232.pdf
    • http://kafuwivul.shaydanielleacademy.com/uploads/1/3/0/8/130874038/xuvukawexak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wowivitotorinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/84255586928.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/8778808465.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/best_rooting_apps_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/93993067858.pdf
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/belgaum_district_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/tapudunej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/zodijutefokatexowiwilotav.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/original_effortless_english_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/pefizonemaginipek.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_off00004040.bin
f219151bbbc6389ecb309bee731a55b7c2178943c70e90472bc549aa8df1379d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4040 5824 bytes
font_01_sfnt_off000053f4.bin
3538f377e9cfb3a2d44c623ab88df315366070a8972bc7ef2f5edb6277b02e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F4 9324 bytes

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