Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f8b66577e1d0b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-24 21:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62a6283f19a03842eed75c68de1578e SHA-1: fe833f1aa0d4247cab308d0daceed5446ccee0b9 SHA-256: 850f8b66577e1d0b3fe31ce4166ed143c66fc56792923c95f6363f8e00dbc0e6
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=analgesicos+nao+opioides+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to "Analgesicos nao opioides pdf". The presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=analgesicos+nao+opioides+pdf
    • http://kipilu.goldencoastbailbonds.com/uploads/1/3/2/7/132712237/valojamivaxoxi-puxenox-mikunifupekuk-luvumag.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/speaking_activities_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/22602138586.pdf
    • https://cdn.shopify.com/s/files/1/0438/0812/9185/files/broken_seether_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2322/files/joxikalezubosojokelevediz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/gary_moore_parisiene_walkways.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/nezotikejobotuzibuban.pdf
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/14275518075.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ed.bin
14360635e47816de75927c77bf74c867361b1064cbec1975b4b8ed8a5ec7cfc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 4924 bytes
font_01_sfnt_off000069b4.bin
44ef351c40662722eabcf340c6c5712617f21bebbc11f57bc9643eae5e7a2144
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B4 10720 bytes
font_02_sfnt_off00008d1e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 4324 bytes