Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd8ec03d909ad90…

MALICIOUS

PDF

45.3 KB Created: 2020-08-08 19:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 916c5341624f4cd246b50bc2f13a744f SHA-1: 459a0f54c2248f31c7d5690316af1f1adf2e600e SHA-256: 4fd8ec03d909ad90006f6024fc3200c3f60e2ed5f82393503f3c3373240c93a4
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO poisoning or link farms. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to malicious content. The document body, though heavily obfuscated, contains keywords related to matrix inversion and the URLs themselves suggest a theme of providing access to PDF documents, potentially to attract search engine traffic.

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=inverse+of+a+3x3+matrix+pdf
    • http://files.yogaforgrownups.com/uploads/1/3/2/7/132711999/sofiwuzarozonug_wuxuvozulodare_xikugezi_niduli.pdf
    • http://files.tempete.net/uploads/1/3/1/8/131857305/cc54322.pdf
    • http://files.lumcky.org/uploads/1/3/0/7/130774993/5852225.pdf
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/2020_printable_yearly_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/zutubakif.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/hematology_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/83560724775.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/65478838666.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/2511762668.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/torogixirorojamove.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/36217838549.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/xoxilobawukevugepofilusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1637/1867/files/10246069129.pdf
    • https://cdn.shopify.com/s/files/1/0439/4598/4158/files/tratamiento_nutricional_para_el_alzheimer.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/ditudoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/xitetunejofomivat.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_off0000668b.bin
e2346a4750e4c530d20b9b06eefda699ed05f2e6468c7233495a4fe39d17babd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668B 5384 bytes
font_01_sfnt_off000078d1.bin
62e62a48a0585f5f081762b46dbaff053344a5d9d73196cbfcd0441413825156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 15248 bytes

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