Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d0b4b50fcd25ce…

MALICIOUS

PDF

59.7 KB Created: 2020-08-15 18:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8117763a4c7bfb1b84ffb142b244718 SHA-1: 3b7b5d1c8a21afea465e5d40126d9e34f0b6461c SHA-256: 84d0b4b50fcd25cecbdedc0869c45efe757d33b2451ec0715e44b10ccaf60743
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a URL that appears to be a lure for Samsung Bluetooth headset manuals. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or scam attempt. The document body, though heavily corrupted, contains fragments of the lure text and the malicious URL, indicating an attempt to trick the user into clicking the 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/wb?keyword=samsung%20bluetooth%20headset%20level%20manual
    • http://files.lavingtonurc.org/uploads/1/3/1/6/131606011/8695127.pdf
    • http://files.hugoedgar.com/uploads/1/3/2/8/132816165/3057520.pdf
    • http://files.contemporaryundercurrent.com/uploads/1/3/1/4/131438211/woguro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/1465653783.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/dajavujadenuluxavid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/56193457254.pdf
    • https://cdn.shopify.com/s/files/1/0450/9289/6920/files/14712637165.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/ashrae_handbook_2020_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/kuvasiziwununijimuluru.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/gijawo.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_off0000ac99.bin
d9f4582ba72a523f37a13cc6f27a721343eb47d728d3aa02d48b3149df23c4f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC99 5444 bytes
font_01_sfnt_off0000bef5.bin
c03a2350b7e695ba1bc9e1f87d32f6ed68a197203f9b9769700d92fa5325330c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF5 10420 bytes