Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca6d68bf25e6d6c…

MALICIOUS

PDF

40.5 KB Created: 2020-09-06 11:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48339eca21b79cb404a5dbe2d4e7342b SHA-1: fef66f6094dbfc7fe1d7505bf94da17105a83b0c SHA-256: 6ca6d68bf25e6d6cb785c8e87366f03575ee20cf1213cd88bcb47f66ec8a6433
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to obscure malicious content. One of these links, https://ttraff.me/wix?keyword=a+kannada+movie++hd, is identified as a known malicious redirector. 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.me/wix?keyword=a+kannada+movie++hd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/mr_taylor_augusto_monterroso_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/maths_question_answer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/nitrogen_cycle_diagram_and_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2383/files/28284003093.pdf
    • https://static.usrfiles.com/ugd/4c1554_a569e1a86eab487d8ebb1a776a51c7e9.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/reganax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/zobegili.pdf
    • https://cdn.shopify.com/s/files/1/0443/6430/0444/files/addition_of_fractions.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/nawitatono.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/til_tuesday_voices_carry_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/detegoduxuvuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/daxejowadevifikikuregatez.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9970/files/6675546808.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_off000061ba.bin
d098b4999101b6761f1a166a548ac8b82e1813629624cabe2406fa95ea071a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BA 4872 bytes
font_01_sfnt_off00007231.bin
5baf628678daa51943cb35bc2a2baf9c2a96177be2d5e0ad68ed41f73df3e8e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7231 10312 bytes