Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc15784ae6a3310…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 06:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f599d5bc908021f5eba469ee04baef46 SHA-1: 213a63e61274efc9db67c4e6fc2af53ad7a66e00 SHA-256: edc15784ae6a3310716e3cdff695a63302319ac6f12eed9987a75f3b376c8455
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, many hosted on Shopify and static.usrfiles.com. The primary malicious IOC is the ttraff.ru redirector URL, which is likely used to funnel victims to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=a+manual+of+laboratory+and+diagnosti
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/25535488019.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/calculating_average_atomic_mass_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/72820021491.pdf
    • https://cdn.shopify.com/s/files/1/0435/9405/5843/files/future_tenses_exercises_bachillerato_with_answers.pdf
    • https://static.usrfiles.com/ugd/12f4eb_98ef867d8dcb45fa9e7d63e3038913a4.pdf
    • https://static.usrfiles.com/ugd/2813e2_d5cac3ac67404cd1bb6575d9181e7c75.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f1532a2c80a424cbfe51b4caba5ce6c.pdf
    • https://static.usrfiles.com/ugd/6116da_b0abc88ca5f64a689b8bc40c2256914d.pdf
    • https://static.usrfiles.com/ugd/b8c837_998c35b929f94114bcb44703786bc381.pdf
    • https://static.usrfiles.com/ugd/8b97dd_40cbf24823064aa5a983b26b85c6a14c.pdf
    • https://static.usrfiles.com/ugd/5a1791_483301c45ec347079f6dda8037ecdfed.pdf
    • https://static.usrfiles.com/ugd/5cf23b_ae14bb5e97504993a0254400795c62ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_64679c48eee6424bac4ab83588e1050b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6477cf545f694567a7980cc4a6bc81e6.pdf
    • https://static.usrfiles.com/ugd/eda9ba_68842de502384fdc8afb8ed8dd5fd16d.pdf
    • https://static.usrfiles.com/ugd/a44510_9b8215d13d5148d4932737ea923547ac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059aa.bin
48a9506449757335272ab2ac734cb20c4612dfa0bfd906e35ce78ee14603a4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AA 5224 bytes
font_01_sfnt_off00006b4e.bin
ea44d67048f0a24b1b0b0c9452148ebd8511db4068398a2af2acd715d31f2aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4E 9908 bytes
font_02_sfnt_off00008d3d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3D 4324 bytes

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