Malicious PDF — malware analysis report

Static analysis result for SHA-256 960eca50e6d11ebd…

MALICIOUS

PDF

39.2 KB Created: 2020-08-13 02:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3be2f2544f74f176fc720b6eb1c58af SHA-1: 3c8017ed0fe11c4679e9680ebaca4473401c71db SHA-256: 960eca50e6d11ebd974efe536113753b023eff8e852084f37cc79fbd716b8708
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.ru'. Additionally, a PDF SEO link farm heuristic fired, identifying numerous links to Shopify-hosted PDFs, suggesting an attempt to manipulate search results for malicious distribution. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of malicious redirector links and the link farm strategy are sufficient to determine the attack pattern.

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/wb?keyword=sifat%20sabun%20pdf
    • http://files.soccerelectric.com/uploads/1/3/0/7/130776276/5089341afa6a2e.pdf
    • http://files.scdsmke.org/uploads/1/3/1/4/131453837/befafadeg-furonobake.pdf
    • http://files.abcoindustrialsales.com/uploads/1/3/0/9/130970008/lezep.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/6915435706.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdf
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/best_reader_app_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/ssat_upper_level.pdf
    • https://cdn.shopify.com/s/files/1/0440/4094/5829/files/kedewewenasetuwitapesut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0440/9769/9992/files/future_ds2_album_download_sharebeast.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/dojudumesajowasilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/3883969722.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/zudigiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/42266466492.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7230/files/fezepufuteviluvakufam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/sofodajodafoluxuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/tajasadofakim.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/7086054050.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_off00005c58.bin
875f4c818a59b6c8b5193d4c816a5972e7042cef9adb491eb2c64f1323984aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C58 5152 bytes
font_01_sfnt_off00006de1.bin
a6976c83484eea4e37304cb1a3ae9be77e9c15c5f648b43fb8cb0997142d2c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 10040 bytes

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