Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0165f45d239c0e7…

MALICIOUS

PDF

39.6 KB Created: 2020-08-07 21:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55aee3ba89e07ab9d3a5e84e9dfd70b5 SHA-1: 5d447f859841e96c6e68d823f90754bc368409d7 SHA-256: c0165f45d239c0e7dc0708c6e414eab2c4cfb453b05c561255a73c5c7a5958ca
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. This suggests a link farm or SEO poisoning technique used to distribute malicious content. The document body, though heavily obfuscated, contains the same URL, reinforcing its role as the primary 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=java+convert+inputstream+to+pdf+file
    • http://files.indianaclassics.org/uploads/1/3/1/3/131398117/xidepu.pdf
    • http://files.moredoorclassics.com/uploads/1/3/0/9/130969402/09df75a.pdf
    • http://files.immigrantallies.net/uploads/1/3/1/4/131483138/8501795.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/82340323212.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/12816351587.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/deutz_allis_9190.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/gurem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/naxek.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/92027584013.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/lire_les_journaux_algeriens_d_aujourd_hui_en.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8838/files/free_auto_repair_invoice_and_estimating.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/risuf.pdf
    • https://cdn.shopify.com/s/files/1/0450/2798/3510/files/chemical_reaction_engineering_levenspiel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5608/6696/files/9017065211.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/18461713373.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.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_off00005d39.bin
66d92aa98370f3a4309c58a721aab2eb2b696ddaf9d92283845140e4ce36a5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D39 5352 bytes
font_01_sfnt_off00006f61.bin
e6e34cb19aa8c5e329e9754e5f3e0bb8e0daca40132e0ee5218e17a0bf8d4ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F61 10052 bytes

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