Malicious PDF — malware analysis report

Static analysis result for SHA-256 1524e4495d26de03…

MALICIOUS

PDF

48.3 KB Created: 2020-08-15 02:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b2f26ef901bee0488b34c982215337 SHA-1: 2d94a04fae6c3126fe8ce45655ec59133ec016d6 SHA-256: 1524e4495d26de033c3eb9664c27f802fc373151aac69bc60dc95654f2cc6104
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely as part of a phishing or scam campaign.

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=templateoptions+angular+formly
    • http://nogugo.mendednest.com/uploads/1/3/2/3/132303382/63927.pdf
    • http://files.lllofts.com/uploads/1/3/0/7/130776393/7e47bc9e194c.pdf
    • http://files.flyinglessonsscotland.com/uploads/1/3/2/8/132815003/fe795c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/11995880485.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/occupational_safety_and_health_act_2020_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/the_worlds_hardest_game_3.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/rig_veda_brahmanas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/jasogabonenabasiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/cadsofttools_to_dwg_converter.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/75091866419.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/minecraft_forums_toomanyitems.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/caribbean_premier_league_2018_theme_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000694a.bin
843e71631b99359e17492aa0d4095e524648428c107e74e251c9ddbff641a91a
pdf-font-stream PDF embedded font (sfnt) at offset 0x694A 5272 bytes
font_01_sfnt_off00007b23.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B23 2116 bytes
font_02_sfnt_off000084ed.bin
088d922e2925768669a057e709f0b3be3967f29867eb3da108fb88d43aea0b1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x84ED 15360 bytes