Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c0bdf4e7c8393…

MALICIOUS

PDF

42.5 KB Created: 2020-08-16 21:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fa82f7457a7cde4b23e5f7af8af110d SHA-1: 73c0ffa6d8fe421cdf2c3b5d3fb42a4beb362e6f SHA-256: 845c0bdf4e7c8393ef0a0c8ebaa022d860bf45afbbe3850bf2931454cd1db068
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=bachianas+brasileiras+4+piano+pdf'. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results to distribute malicious content.

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=bachianas+brasileiras+4+piano+pdf
    • http://files.en.fteacadia.com/uploads/1/3/0/8/130874012/3339915.pdf
    • http://files.marineconservationlab.org/uploads/1/3/0/8/130874526/zikogoleminumebew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/gexudenapusarilaramuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/12465491147.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/foraloz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/69525865009.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/fonasilomenizutube.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/gasexasufavirupakipofoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3930/files/9568450217.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/xawuluvozewokozal.pdf
    • https://cdn.shopify.com/s/files/1/0446/0855/3123/files/calculus_by_anton_10th_edition.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_off000067eb.bin
18f4da9a607c16cd06d1433b046597768eb03c23a4a0851eb31fa7a67aac2022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EB 5520 bytes
font_01_sfnt_off00007a97.bin
feb2294907180b2800ce3d24d5cdfc10e1ef96d3496552a95f3d2d2932d34c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A97 10172 bytes

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