Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8f56c87db7f54d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-15 16:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2236aec0305b5e287f169e2f576531ca SHA-1: 52ae5e48b24048df2c4b50ac2fd107a69c20b553 SHA-256: ff8f56c87db7f54d767beb1c8a65394b3eb681b639ff8103cb35dd744a33b075
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm, with many links pointing to Shopify domains, likely for SEO poisoning or to host further malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF links, suggesting a lure to a malicious site.

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/wb?keyword=advanced%20origami%20dragon%20pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • http://purused.sinthiacousineau.com/uploads/1/3/0/7/130738993/ed0851.pdf
    • http://files.neokundalini.org/uploads/1/3/1/4/131454586/numemelogabiwira.pdf
    • http://files.envisioneyewear.net/uploads/1/3/2/7/132740462/4146261.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/jetedorikosetawon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/38162162504.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/befevavusaxigo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/gordis_epidemiologia_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/pijuviroxokosolov.pdf
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/dead_space_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/zupijawotanalarow.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/oh_prasie_him.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/mubawaxaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/1874/0134/files/lijomaniluponekupagipem.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/js_random_range.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_off000051e0.bin
5f32158af6a45ee213b0b809d0baa213d07afccf15c50cfe4891a6dfd97415a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E0 5104 bytes
font_01_sfnt_off00006383.bin
f74db4bd909b4c8b5cb1bef41f733316738b10695bdbce6492bb487a40f4191b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 5312 bytes
font_02_sfnt_off00007585.bin
25ad39558c702587c31353e7c765d97c913cdf0a8d8c496d97cfde7a8d3e2dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 10412 bytes

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