Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adc5b1b3b639dfd…

MALICIOUS

PDF

48.0 KB Created: 2020-08-19 07:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 877aa2ada49276c2165afef1d17f2275 SHA-1: f3c7c9bb7ce20ef892bddd2211d8989633360d97 SHA-256: 6adc5b1b3b639dfd9a8dc60287a6d3ad97745ca3c35fe5a11fe99b72459c24d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to 'ttraff.com'. This suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier also flagged the PDF as malicious with high confidence.

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=not+funny+didn%2527+t+laugh+dk
    • http://files.reach4thestarsstore.com/uploads/1/3/1/4/131406182/tepuzikofep-jinajofabujis-vumeluzokalimut.pdf
    • http://files.nrmorenorealtor.com/uploads/1/3/1/0/131070911/4f8081662.pdf
    • http://files.stetsonministries.com/uploads/1/3/2/3/132303041/6533791.pdf
    • http://vutudofu.norenbergtax.com/uploads/1/3/0/7/130740019/eac264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/kebiwuvuzigowef.pdf
    • https://cdn.shopify.com/s/files/1/0429/2083/7279/files/gajozuvigusaxuwigubib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/statis_pro_baseball_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/bepulapu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/anglais_francais_dictionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0436/7591/0294/files/task_struct_linux_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/biquad_filter_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemopijudesukofareran.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/2003_yamaha_v_star_1100.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/nationwide_insurance_claims_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/59711396798.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/11615617318.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a1.bin
ace2bca5e0018daa8c0d0a8da817b349d2ba0bf197d4e903139d988b6499663a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A1 5064 bytes
font_01_sfnt_off000078f6.bin
54055153d8a7dd45062471d8ceb24c08665f407f0a9dec0e64df56aae0b95fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F6 10512 bytes
font_02_sfnt_off00009d31.bin
8e6f44f21a6cb6464db7b2705935d0eed1bbcefc8c2e8ed09117199423754ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D31 16332 bytes

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