Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74a27c5d0b4ff2f…

MALICIOUS

PDF

63.5 KB Created: 2020-08-24 07:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8310ed6163edbee10e924834c5e2c3f SHA-1: f3c3cc9780388eafda15078641fe0e16175002f7 SHA-256: a74a27c5d0b4ff2fd7cf97c4a7c3c730308e00db85aa72f769a9aa3b30f09ae0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a lure for a "Baldi's basics mod hack apk". The document body, though heavily obfuscated, contains this URL and other embedded URLs. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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=baldi%2527+s+basics+mod+hack+apk
    • http://notaxipil.wctohio.com/uploads/1/3/1/8/131857920/dadf842499de60.pdf
    • http://files.heart2heartfs.org/uploads/1/3/1/3/131379183/zinovozopuso.pdf
    • http://files.qualityucantrust.com/uploads/1/3/0/8/130874554/db49971d5.pdf
    • http://zixagasiz.julianpahre.com/uploads/1/3/1/3/131398140/1dbec2912cf06c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/30903282354.pdf
    • https://cdn.shopify.com/s/files/1/0437/9554/6273/files/31734995977.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/riesgos_laborales_en_odontologia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30072581460.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/starbound_quest_ids.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/jerogel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/54488025545.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/dozawuvowekidevoposo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/nomofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1475/7288/files/les_actes_administratifs_unilateraux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/91133320514.pdf
    • https://cdn.shopify.com/s/files/1/0434/7943/3382/files/admin_panel_roblox.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_off000088e0.bin
0d9d16f2b10a8f3f246a0d1aab22cea7104105869c34c7fd528c95afea4a9038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 5504 bytes
font_01_sfnt_off00009b6f.bin
b7dbd5d8109d883357c8f45ae379b030bf365fad506248bf8c4e14b44808c72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6F 20672 bytes
font_02_sfnt_off0000d5a3.bin
b1b88cc37e2a6557793fb25c8a4ac1af71a6745c22d57a19537bf708b1de4017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 17352 bytes

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