Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d35548067ef2d92…

MALICIOUS

PDF

41.5 KB Created: 2020-08-23 23:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f769ac241b0ae371d0bd6901cdda96 SHA-1: 30c6a6251b647d50cc3891b7bc604366fc13816c SHA-256: 6d35548067ef2d9240e882dbbd3c5f9ebd917ea59ff47839619d059dca6c838b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to a 'cabin crew cover letter format' and the malicious URL, suggesting a phishing or scam lure. The presence of numerous external PDF links also points to a link farm, likely used to distribute malicious content or for SEO manipulation.

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=cabin+crew+cover+letter+format
    • http://files.nurseshantania.com/uploads/1/3/0/7/130740249/faxedejakinevezid.pdf
    • http://roneje.tessaviamontephotography.com/uploads/1/3/2/3/132303382/gekesi.pdf
    • http://files.brightideas4u.com/uploads/1/3/0/7/130775053/1084094.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/17644350381.pdf
    • https://cdn.shopify.com/s/files/1/0438/0819/4722/files/auto_electrician_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/26457990683.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/97842142390.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/liver_abscess_antibiotic_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/84881366070.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/73216340977.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/90952212836.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/blender_rotate_around_object.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/36096966509.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/98857450672.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/politica_aristoteles_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0462/6399/2477/files/white_as_a_sheet_meaning_and_example.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b4.bin
750f79061d2040366cd30a2d197fa5fc657557b7d9f170bc793cbd0694502eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 5048 bytes
font_01_sfnt_off000074dd.bin
3babb4af045c04eef3598b7fdfc2f1811f60123caabb4d158f22a8fc054f0cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DD 10612 bytes

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