Malicious PDF — malware analysis report

Static analysis result for SHA-256 a427c3f1ac90edc3…

MALICIOUS

PDF

36.5 KB Created: 2020-08-10 21:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 297a74bb20f64624e17572981d000518 SHA-1: eee82428e9e5bfb91116fcb951b89c783871a196 SHA-256: a427c3f1ac90edc3443c4d2eaadf27a8202fe4c660d068f82971222ccc84b55c
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL embedded in the document body. This redirector likely leads to further malicious content or exploits. The document body text, though partially corrupted, suggests a lure related to an 'answer key', aligning with common phishing tactics. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=aha+acls+post+test+answer+key+pdf
    • http://files.axeskiphire.co.uk/uploads/1/3/1/4/131453031/629176.pdf
    • http://files.panthereducationtrust.org/uploads/1/3/0/7/130739693/xosonasisatug_wemigezulik.pdf
    • http://files.theglitterfromashes.com/uploads/1/3/1/8/131856446/barivemo.pdf
    • http://files.networkhearing.net/uploads/1/3/1/4/131438501/69977b682761a.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/86530285665.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3189/files/41382066699.pdf
    • https://cdn.shopify.com/s/files/1/0434/6694/8773/files/vamovivuzadosidagez.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/word_search_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/gomaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/osaka_amazing_pass.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/87692504969.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/robapiwisuxafopum.pdf
    • https://cdn.shopify.com/s/files/1/0433/6635/0998/files/nakisubabumoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/81016552762.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/ravopabobusebanizimoju.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/barnaby_rudge_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/gexijasegumipoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/91429271132.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_off00004727.bin
3bb5c47f45d58570f87f5a8a80fc97f1057fddf00aa193b3130ea7c152c99644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4727 5228 bytes
font_01_sfnt_off000058f2.bin
20a8ab911d47e4bd879d6e9017528f6eb5038c04d254c0ebe0ecc8ec0fed6ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F2 8744 bytes
font_02_sfnt_off000076ca.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CA 4324 bytes

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