Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52bcb3c6dbdc8f4…

MALICIOUS

PDF

49.1 KB Created: 2020-08-08 20:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60209fcd43f19de4fa86da16156f82ec SHA-1: 1c2e0e39dcfd0c3fb763fa7120962ad392a3026d SHA-256: d52bcb3c6dbdc8f47757120323cbc2c001f99354443cf73b3d09230e5822f240
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 of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the target URL, suggesting a social engineering lure to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer malicious intent.

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/wb?keyword=auditing%20fundamentals%20in%20telugu%20pdf
    • http://files.insuranceassociatesnw.com/uploads/1/3/2/7/132741081/kasitowajunudo.pdf
    • http://files.andrewmarkel.com/uploads/1/3/1/0/131070351/bosoforuxami_firas.pdf
    • http://rimomo.catfishingwinnipeg.com/uploads/1/3/1/4/131437987/paxapidopo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/95818774736.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/sims_2_cars.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/42101057220.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/ramadan_time_table_2020_dubai.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/famavudusajalejelum.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/kepizow.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/kafugune.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/87686795336.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/learn_to_fly_idle_hacked.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_off000082c6.bin
b37b2c400bc4ccdf2bc613e8aa9155cacacc5c25b0a1b6f34776385cd9eaa8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C6 5256 bytes
font_01_sfnt_off000094a3.bin
6627ef0cd06e2e47e086b839a418da1170a5c833cb7ad3827d50a442d2114284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A3 10480 bytes

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