Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8dda385fe61cc0…

MALICIOUS

PDF

54.0 KB Created: 2020-08-25 22:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0f626cc0f9708b4258396dd73c7008 SHA-1: 13580723d2a7563e47e2adc81a25e00c7a337e15 SHA-256: 4f8dda385fe61cc0a783f400aed353396e7c8a9a3d97ccb5ac78eb4f1220a65d
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=gta+san+andreas+videosu'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=gta+san+andreas+videosu
    • http://files.stellasaintboutique.com/uploads/1/3/1/4/131452735/9f4bcaadf9ba4.pdf
    • http://files.fcchartselle.com/uploads/1/3/0/7/130775918/pibaj_vapepi_zunub.pdf
    • http://files.kantishnaouterwear.com/uploads/1/3/0/7/130776887/7229470.pdf
    • http://vitanib.smarterwaytowrite.com/uploads/1/3/0/9/130969060/renodidore-juwitabiza.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/sogezatom.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/42384043244.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/bevag.pdf
    • https://cdn.shopify.com/s/files/1/0448/1790/7874/files/3ds_max_animation_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/56815023478.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/40366205266.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/damidonalopomezurowi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4968/files/wovikeluzivegimekusozolem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/zombie_catcher_hack_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/86842770310.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/19886773609.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/watobaseratuw.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_off00008911.bin
013083c4537531d359deccce13bd97dbaad40615e7cb8d8b69b53b3a1ed84dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8911 4876 bytes
font_01_sfnt_off000099bd.bin
e2784cf0869d343d9dc1efffc07a3760b08e0da8e7d19f97d79bba72d7ee78f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x99BD 16160 bytes