Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b801a4fe9c7dac9…

MALICIOUS

PDF

42.9 KB Created: 2020-08-24 09:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 365a648c7e344a5d41002ba4184d723f SHA-1: 354f4af28ed4529e87923898defe66c12377011d SHA-256: 4b801a4fe9c7dac9fdc73305f378145c3c93ec2de7c2941bdf88b8af6dc1ccd8
152 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to the presence of a large number of embedded links, many of which point to the redirector URL https://ttraff.cc/pify. This technique is commonly used to obscure the final destination of malicious content. The document also contains a link farm, suggesting an attempt to manipulate search engine results or distribute malicious links broadly. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of its specific payload.

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=ciencias+auxiliares+de+la+historia+pdf
    • http://nojaso.jessicabhernandez.com/uploads/1/3/1/3/131398444/maveluwenerude-pasapugefiwozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/62568649039.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/cadbury_report.pdf
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/95598018024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/asoka_movie_hd_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1394/files/90365821475.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/50598440094.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/yamaleela_2_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/dalewarozivotigakumib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/83726506013.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3036/files/assamese_new_audio_song_2018.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_off00005d6e.bin
a61f73a886e4e1e7679d651b19490d24440bf45fe638de80ed73665a3bd2573d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 5216 bytes
font_01_sfnt_off00006f1f.bin
87d01647a6ddebfc6e662748288eb891eb0ce7e4367efcfac7c31b7d8478b92b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1F 15336 bytes