Malicious PDF — malware analysis report

Static analysis result for SHA-256 567ac4fc8a8e9585…

MALICIOUS

PDF

43.7 KB Created: 2020-08-03 16:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca1f43d578e923ef1ea65048a1b82ab4 SHA-1: de81dc83d9d0723fe6665e4d8ca27582a78fe169 SHA-256: 567ac4fc8a8e9585889046472b8c5247570b4ddbef721361e32e5e380a2bfa16
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the string 'https://ttraff.com/pify?keyword=ccna+1+pdf+portugues', reinforcing the malicious redirector finding. The primary attack pattern involves luring users to click on a link that appears to be a benign PDF but redirects to malicious infrastructure.

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=ccna+1+pdf+portugues
    • http://files.theheartexhibit.org/uploads/1/3/2/6/132682934/lizugipapoju.pdf
    • http://files.albasmadetergents.com/uploads/1/3/1/3/131384771/7292020.pdf
    • http://files.examinators.com/uploads/1/3/2/6/132681212/4535292.pdf
    • https://ciscoredes.com.br/quiz/quiz-ccna-1/
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/53598389442.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/98883680482.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/68341947464.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/95824193779.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/rejatoxokebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/13492297701.pdf
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/nagijinujuxugapilib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/34093464328.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/typing_of_the_dead_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/jugutuxitijafunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8223/6572/files/lonet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/rotofusowurim.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/bajidudajorowig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/jirovilud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/motowuk.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_off00006c0c.bin
c50d446a7ef92e41cfd13a6f29c1f9d18f03b65058bc8102a4ad4bf751ae1def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0C 5248 bytes
font_01_sfnt_off00007dfd.bin
0bedf1efdcf57519e437bbf94adee047c8807b56b98e93d0969ab901ae6220b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFD 10620 bytes

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