Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b939e01b1fd057…

MALICIOUS

PDF

36.7 KB Created: 2020-08-19 03:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c78f6c5d7b75b8c40548e87f37800f91 SHA-1: d19d446740c4dc2dd6b2a0be2b2aa0fc6a8dbb82 SHA-256: 32b939e01b1fd057b3553cadf39686a50a7bf685f45f6a836965949550e72e89
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=tipos+de+actuadores+hidraulicos+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several Shopify-hosted PDF links, reinforcing the lure.

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=tipos+de+actuadores+hidraulicos+pdf
    • http://zivitaje.worldwidetargeting.com/uploads/1/3/2/7/132740458/9375b950aaf8.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/lodanikutis.pdf
    • https://cdn.shopify.com/s/files/1/0449/0631/5943/files/20229315009.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/99747204341.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4815/files/99767259790.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/nadafumediw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2381/files/19562041239.pdf
    • https://cdn.shopify.com/s/files/1/0438/8713/2827/files/anthropometric_data_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/keras_conv1d_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/rolling_stones_top_500_albums_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7417/files/wowugololirerelomozeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/revista_cero_en_conducta_numero_53.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_off0000514c.bin
0391a10411152e275b2ee44b697124bfc292376219d6001836b8b60842edccaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x514C 5192 bytes
font_01_sfnt_off000062e9.bin
a06edc7ee6e2321f9fa4a665bd9f8df5611a2ac8f5c8aa0b8375bf28139c184e
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E9 10328 bytes