Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8761275c08d29e…

MALICIOUS

PDF

58.7 KB Created: 2020-09-02 11:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d45b5be377670273db3ea0d6c1594fe2 SHA-1: 6eac4e61a3e3a659aa70b7eeb7042ab8f163cbfc SHA-256: 0a8761275c08d29e17aee0bdaed41c8ac3c0db6af2b3ab70be321045a55f141c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, https://ttraff.me/wix?keyword=android+canvas+draw+empty+circle, is identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates the presence of numerous external links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=android+canvas+draw+empty+circle
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c068f8_2be1602ef6824c34a9efbb103a52a79d.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_4d22a09da47a40689f6f737b7c31b1ce.pdf
    • https://static.usrfiles.com/ugd/f59309_333b3e3c4b5e42d3a626eec8ebbf85ec.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_274ef1532f77456e9d11a922f7dc868f.pdf
    • https://static.usrfiles.com/ugd/902d29_f93c061282824cac9d3fbb4fd507706c.pdf
    • https://cdn.shopify.com/s/files/1/0434/6799/7344/files/wavemidetagobowisufater.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/accords_guitare_jazz_manouche.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9377/files/vajatufabevenutumurisekid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0756/5214/files/jemawogaxutaxupulojemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9267/9582/files/91476530809.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/gamoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/47306952926.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/nedenupuwiripuba.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/15927371326.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e0a.bin
b99bdf2b465269fb1b0af40c6520e42e8a6f143fd584a8bd504a515c6ab161d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 5460 bytes
font_01_sfnt_off0000a09f.bin
084e7e46878aa72dea745721cc8480d77c36a965b48b71bbe1e774c8ff09a159		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA09F 12244 bytes
font_02_sfnt_off0000c8da.bin
b2496bc0077c879636d574bbee2d4602aa63378ef56daaa423ce8e1caf54ad98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 16116 bytes

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