Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7354311d7399b9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-15 04:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d593c3e8b12fce50abd99a7801d59b SHA-1: 4cf3307d6f658aa9aaadc072d416a135e30ff406 SHA-256: 8a7354311d7399b9d9e32127bd05bfc8b677b48d2f0d16fca735ea22b79dc5b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.com/pify?keyword=antibiotic+prescribing+guidelines+uk+dentistry`. This URL is presented to the user as a document title, likely to trick them into clicking it. The PDF also contains a large number of external links, many hosted on Shopify, which is indicative of a link farm or SEO poisoning tactic. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=antibiotic+prescribing+guidelines+uk+dentistry
    • http://files.freedominmotionat.com/uploads/1/3/0/8/130814234/5f2454.pdf
    • http://files.brigidvidler.com/uploads/1/3/1/4/131408738/8225.pdf
    • http://files.maahomestead.com/uploads/1/3/0/9/130969700/3179952.pdf
    • https://cdn.shopify.com/s/files/1/0431/7557/5709/files/kedazuxegibenezofuwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/wirimipesutorolubakovek.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/fabobozal.pdf
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/46346398573.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/87761151315.pdf
    • https://cdn.shopify.com/s/files/1/0434/4401/1168/files/he_hit_me_up_hey_ashley_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/gososakogupenofegarefuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/nirefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/jopudujovakepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/saints_row_2_gentlemen_of_the_row.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_off00005d77.bin
428411ae1c2ca83c65d61af9f6a85185654a7c29dd4c92dab1573eea7975ffe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D77 5208 bytes
font_01_sfnt_off00006f32.bin
5dd6ff447523fa4032a2ac47f7dfced3e2f6a1b78ac763ecc263991b0498a1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F32 10424 bytes
font_02_sfnt_off0000928a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x928A 4324 bytes

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