Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec83ce4cd9c4652…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 23:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d91384837f886033946b433a49a48680 SHA-1: 9a591d57980ec0bbd3aa1915a7b04fece01b78e2 SHA-256: aec83ce4cd9c46527eeba30b0bfef957b85ade6516f624cd50c9a87821e2fc4d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, to 'ttraff.com', is identified as a malicious redirector. This suggests a link farm or redirection attack designed to lead users to malicious content. The ML classifier also flagged this 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/wix?keyword=introductory+paragraph+introducing+y
    • https://cdn.shopify.com/s/files/1/0435/4198/7479/files/fobegobesaviwubumuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/69536408613.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/ejercicios_ingles_2_eso.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/canara_bank_credit_card_statement_password.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/christafari_christmas_album_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb82a22829c948088fe3de00d5cd58b0.pdf
    • https://static.usrfiles.com/ugd/7dd30d_ff10e0c8a9ac407dbd077d90933f7431.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f42116102f64ca3866508ef0553202b.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/foxejuwasujexurexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6409/files/13401067642.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/magiwupapupimikokorane.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9079/files/canon_in_d_piano_free_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/swgemu_village_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/0063/3243/files/difimadux.pdf
    • https://cdn.shopify.com/s/files/1/0457/4878/1212/files/nekixidodelunejebono.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9006/files/mamibatekizorowobisiwo.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_off000069b9.bin
e93ed625105fee9c613557a7fcfe8aba6f5ff3a00b16593d6dc06e765597ecee
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B9 5164 bytes
font_01_sfnt_off00007b45.bin
1ef8596d7ce6d0acac9bc4f3a2fe2b1341c622c22b5cfe24245eaca9560be3b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B45 10420 bytes