Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31caf2de78c1d17…

MALICIOUS

PDF

54.0 KB Created: 2020-08-30 21:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed37a2702a36937f104891cd413bb052 SHA-1: 2966d3dbd831b2c1466a3d34ceadc701963be7d3 SHA-256: d31caf2de78c1d176d5dfe1bc443ee63358ca09b47768ce307de0583decc370e
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=adam+driver+dad'. Additionally, it exhibits a PDF link farm behavior with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a potentially 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.club/wix?keyword=adam+driver+dad
    • https://static.usrfiles.com/ugd/a4e402_c61d854d2794493a98c1926f77223bd2.pdf
    • https://static.usrfiles.com/ugd/e2b09b_e542e90e196e4a59b00041738aa438d0.pdf
    • https://static.usrfiles.com/ugd/bfbc46_aad265da7cf04ffd8d859f61dfa858aa.pdf
    • https://static.usrfiles.com/ugd/cec570_adda86a8581449f5b9225559152ed99a.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcb5058c29704033828765542c911985.pdf
    • https://static.usrfiles.com/ugd/b8c837_926c32d8cf9748e6ad86142add143333.pdf
    • https://static.usrfiles.com/ugd/429b25_c855fe4773014b1e95e1cafc0184dd30.pdf
    • https://static.usrfiles.com/ugd/97493d_e7cffffcf88f4bc7bcfff7ec14a90926.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/e_okul_kitaplk_oluturma_program_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/mutagobezedag.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6837/files/epistaxis_slideshare.pdf
    • https://cdn.shopify.com/s/files/1/0462/3859/7280/files/you_didn_t_answer_in_spanish.pdf
    • https://static.usrfiles.com/ugd/b8c837_81171a28561940d09ed1a8e461cc24b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e67c661341a3448387066be30e9d4062.pdf
    • https://static.usrfiles.com/ugd/286fb8_6c68524f67944e8fba7d1a8099b7cdfb.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_off0000980f.bin
092de693abfa0df2cb025648a8a4536cc15e094474e019f60ddacfd7d541a286
pdf-font-stream PDF embedded font (sfnt) at offset 0x980F 4808 bytes
font_01_sfnt_off0000a856.bin
5505169fd0a9c3e84a50283e03e086b6489e8a0538a5e7281efc8e33920037dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA856 10304 bytes