Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2195893b4a5f6e2…

MALICIOUS

PDF

49.1 KB Created: 2020-08-24 11:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd10aa24bd6134bfc4401436957e9fb4 SHA-1: 37bdbb9209cdd07d82067b396cf41abe7ec54bdd SHA-256: d2195893b4a5f6e2539be71292595715d494972883322166f65e8420a5512bc3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is presented in the document body as a 'Completed form ds- 11'. This indicates a phishing or social engineering attempt to direct the user to malicious content. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning technique to obscure the true malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=completed+form+ds-+11
    • http://xirim.w-here2stay.org/uploads/1/3/2/6/132682347/4794229.pdf
    • http://fevulak.chrishenkaline.com/uploads/1/3/2/6/132682076/4077284.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/rilixuvajonanore.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/69939775099.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/foguwukoxumikevuxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/49189548690.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/54220906874.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/aircrack-_ng_mac_os.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/bsc_cs_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/honda_outboard_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7625/files/task_factory_fromasync.pdf
    • https://cdn.shopify.com/s/files/1/0430/4266/8698/files/75000746165.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/bonpalashir_padabali_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/badinerie_bach_trumpet.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/epistemology_ontology_and_axiology.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8437/files/sasiserefopulobumigoziw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9045/2387/files/90297186513.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_off00007bd4.bin
31495fe8842514dcf7d73d2ec9db20783b291013ec2c658732cc32bd3e20255a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 4968 bytes
font_01_sfnt_off00008cb0.bin
03847876320cc3df9fde2be64efc7fe3ea8a39c21b19c53aedd7a95e54b00d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB0 13700 bytes

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