Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d81f89acfb220f5…

MALICIOUS

PDF

33.1 KB Created: 2020-08-02 22:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76692bf278522ca2df33449e219d081 SHA-1: 2ef22ab5eb1791995fc56be0dec56d751b934bdc SHA-256: 9d81f89acfb220f5cff62a2068e511b2ab7ed1b1cdf9d090084dd74332a644d0
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results for a textbook, but ultimately redirects to a known malicious URL. The ML classifier strongly indicated maliciousness. The primary attack vector is a deceptive link within the document body, leading to a malicious redirector.

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/pify?keyword=john+mcmurry+organic+chemistry+9th+edition+pdf
    • http://files.stevewelchcreative.com/uploads/1/3/1/3/131398517/xovanakilivo.pdf
    • http://files.gardenviewfarmnigerians.com/uploads/1/3/1/3/131383727/worefipajetamax.pdf
    • http://files.jchambersconstruction.com/uploads/1/3/2/6/132695455/5989430.pdf
    • http://files.nityakumar.com/uploads/1/3/1/4/131410012/5736492.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7142/files/pinipijama.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/xuximaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/wewumizexinoluvobokol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/lixevuref.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/75821470931.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/linukolusakiborev.pdf
    • https://cdn.shopify.com/s/files/1/0434/9054/1733/files/59957303534.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/96926351334.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3959/files/naribazidakufabagasexa.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_off0000421d.bin
15297b21f911fff7065e8ede8fb8d12a0e8823bbac72b9de32bb85ec221614bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x421D 5784 bytes
font_01_sfnt_off000055a6.bin
b091c0b915b7123dcb93aec41681a9a47112656f8c79f9ca6b29d54a68de4218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55A6 9900 bytes

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