Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bdd55ed99706c4…

MALICIOUS

PDF

35.0 KB Created: 2020-09-03 01:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d340a8ec244540489c1de856e19192ee SHA-1: 2ad3d84c17b51c2aa5718f61c7902dbd46cc35c5 SHA-256: 25bdd55ed99706c4f95d6b9f12d8e697ac806a248c6a2ce0722b232b901fe817
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.link', which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same search query as the malicious URL, suggesting a lure.

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.link/wix?keyword=badrinath+songs+telugu+free
    • https://static.usrfiles.com/ugd/c068f8_99b80a9edbe8444b9e9d9a4704604ea3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7dff08cdc934edf9583b34df90f6ec4.pdf
    • https://static.usrfiles.com/ugd/0bfb20_f2af1d13b38a4f47a8594874c2fd4a4b.pdf
    • https://cdn.shopify.com/s/files/1/0433/2489/9496/files/vukedubefeliwetoluj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/pixetudotezeza.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/cours_sur_les_batteries_d_accumulateurs.pdf
    • https://cdn.shopify.com/s/files/1/0461/3763/9080/files/30105341799.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/72801830797.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_9fbc82c99ff744fa8258e1bdc475e45b.pdf
    • https://static.usrfiles.com/ugd/c1108c_9064a5847cc24aa4946fe61ad941ac64.pdf
    • https://static.usrfiles.com/ugd/cb2bed_f487c3f0a5dc497a94d86b5c3205cb0a.pdf
    • https://static.usrfiles.com/ugd/565485_b743515b27204121a8216f4f7caeb06b.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e65490c53b4a0c88aa030be9b7a340.pdf
    • https://cdn.shopify.com/s/files/1/0437/5868/2273/files/17426519132.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6064/files/cbre_bi_monthly_research_report.pdf
    • https://cdn.shopify.com/s/files/1/0464/5198/2504/files/20804490245.pdf
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/vujagabefelowab.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_off00004a17.bin
791df970183645533162a8ffc2cdfa6a534fdbda6b48d3e40d8ef21d1588174f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A17 5220 bytes
font_01_sfnt_off00005bd2.bin
6c219c607da1d7c25bd59d4a107ccd73ddf2336d4da1e8f1a56f9a7ea77582c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD2 11008 bytes

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