Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbbb1c4f3beb226…

MALICIOUS

PDF

44.3 KB Created: 2020-07-31 22:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2230dd4a37575ee72d68ced7c9cfd23 SHA-1: fabf84ffc240195481e1fc3dcf02f258e1714298 SHA-256: 7bbbb1c4f3beb226829861d51f2d764cced403cea5a9dd90c5c397fb21cf84bb
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a study guide. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The document body also contains the malicious URL, indicating an attempt to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious.

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=customs+broker+exam+study+guide+pdf
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdf
    • http://files.lynnwoodheating.com/uploads/1/3/1/8/131856446/tezume_saboti_wavek.pdf
    • http://files.hunterella.com/uploads/1/3/0/7/130775108/9d0cf2ffab4.pdf
    • http://files.lovefeastgathering.com/uploads/1/3/1/1/131164081/2211740.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/wuvazebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/patisokuvenur.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/38759458795.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/19524384479.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/wezenit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/8056902827.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/32557973696.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/48468935136.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/gevemofilibakonila.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/fulevumarafutorotenepad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58580374151.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/xejuwidulubelasoruwobibob.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_off00006de5.bin
cceb231a8125c4f42653d88121a757d0ea9bd780edcea9131c6a2c8fe3c2cd37
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 5608 bytes
font_01_sfnt_off000080ec.bin
612bf07d2adb059ada20630f455029332f9c8e9e0ae46d6ae70fca63de9344e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 10540 bytes