Malicious PDF — malware analysis report

Static analysis result for SHA-256 75abf398c48a9c41…

MALICIOUS

PDF

45.7 KB Created: 2020-08-19 16:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3a58a934c780f815e95fd4a22fe5d9b SHA-1: 1148a1f947143a3af6f90ed401d5d45186bf865c SHA-256: 75abf398c48a9c4169c7f39cfbb4e3723e536a863b41ea8f3ac5e2c9deb2cc70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text related to a 'catheter insertion procedure pdf' and a URL that mirrors this, suggesting a lure to a malicious site. The presence of a link farm further indicates an attempt to distribute malicious content or traffic.

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=catheter+insertion+procedure+pdf
    • http://files.houstonmiddlepto.com/uploads/1/3/1/4/131406717/d4722faa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3866/3079/files/zuwoferapurajaxetivopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/acog_practice_bulletin_183.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/14564590836.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/7092642726.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/dumofovanonufewam.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/blanche_neige_texte.pdf
    • https://cdn.shopify.com/s/files/1/0430/7707/5108/files/25615937400.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/14575839570.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8349/files/32580246848.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/rudozivap.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/dumuluvamonipuwagolododiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/insomniac_city_bill_hayes.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/actionscript_3_game_tutorial.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_off00007543.bin
604e18f9879522c9f2aaf5e6ad22feb25b24b9784a03111a4bf5f2685c8127b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 5116 bytes
font_01_sfnt_off000086a0.bin
bdf3d40d23f3a950206f199bd62e2b595c885b8489870c01b3016d1e7f77d6a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x86A0 10376 bytes