Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b0657b92e27340…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 01:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2702fb5cdf44eb29b0e23edbf7b9312b SHA-1: 71a10516dd55a86983c912bf4d459694593b5476 SHA-256: d5b0657b92e27340772917c5e592fb49922c335fecb5e85aa709d0cc86091485
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword related to data security to disguise its intent. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking URLs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content.

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=data+security+definition+pdf
    • http://files.pimgro.com/uploads/1/3/0/7/130776037/7218927.pdf
    • http://kevibi.s-gbuilders.com/uploads/1/3/0/7/130739678/9850418.pdf
    • http://files.parknknit.com/uploads/1/3/2/6/132695492/terupeded.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musuvagexas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/55036727099.pdf
    • https://cdn.shopify.com/s/files/1/0447/9988/5463/files/calendario_2020_colombia_con_festivos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/wosaxelanul.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0520/files/resignation_letter_sample_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/jexedepogadadegipaka.pdf
    • https://cdn.shopify.com/s/files/1/0440/5788/6870/files/69783252858.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/bumevofimovolone.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/jatuxipidefuwerexefir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60561448525.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9616/files/31616832892.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/zubapelasegojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/86533345903.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/zefabirew.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_off00005d1a.bin
27de2a9ff96e857011c184ed955f7c4fc31b5849d217994ddcd6ef0980a97216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1A 5100 bytes
font_01_sfnt_off00006e87.bin
09734b94a883549f7474a58624e1c107e68b0a4b5f429e04dd15fe9cd9fb1513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E87 10336 bytes
font_02_sfnt_off000091cc.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CC 4324 bytes

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