Malicious PDF — malware analysis report

Static analysis result for SHA-256 501696f7dd2ad646…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 10:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea837647f71eef02aa79d56b1202e193 SHA-1: 4c5eed1ec589f1bf5797096ae06f1de88400ff89 SHA-256: 501696f7dd2ad646278d67786493feae646df28206f72f7a24ee14efa51f64f6
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, likely intended to trick the user into downloading malware. The document body, though heavily obfuscated, contains the same redirect URL. The presence of a link farm suggests an attempt to improve search engine ranking for malicious lures.

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=avidemux+32+bit+deutsch
    • http://files.brianoconnell.org/uploads/1/3/0/8/130813768/9a38e4ccf3c.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://notur.hemp-aura.com/uploads/1/3/0/7/130776260/gotolamene.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/1680341619.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/maritize.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/38686376690.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/miwojigokifapowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/sufemewutorazaxenagaxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/43816497603.pdf
    • https://cdn.shopify.com/s/files/1/0450/7874/1155/files/wojarutolajasezube.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9100/files/87963363147.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/jutatitebakasulujak.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_off0000642d.bin
b1bfde6370ea21f00ea50741f7f34388cca6877e81582b3f69646c3933cceb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642D 5396 bytes
font_01_sfnt_off00007668.bin
6a547889a4ae0b3e44291fd0067e04c0c1218fabfbd0993e8e8a34f43adf6e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 10652 bytes

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