Malicious PDF — malware analysis report

Static analysis result for SHA-256 650c2d4edfa84886…

MALICIOUS

PDF

49.5 KB Created: 2020-08-04 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c648e01f90539ab3db40bbe6b93fa56 SHA-1: 29dbb09bb0419678bc8718c0b50911414f7f440e SHA-256: 650c2d4edfa84886c46fb588d878d6b2498864a5a7574af4976710fc6a75d5fd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself contains obfuscated text and URLs, including a direct link to the ttraff.ru redirector, suggesting an attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=gre+analytical+writing+argument+topics+pdf
    • http://files.magafricangoods.com/uploads/1/3/0/9/130970003/woxonus_siroxujo.pdf
    • http://files.matthewmiles.co/uploads/1/3/1/6/131606366/vigofitup.pdf
    • http://files.simongibney.com/uploads/1/3/1/4/131452883/dukurosewifeni_rikuvojofegun_dejifamaxogal_dafutolozenexa.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/29263335868.pdf
    • https://cdn.shopify.com/s/files/1/0434/4066/8838/files/38452575556.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/jovoleda.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/guxufafefipogij.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/17874929030.pdf
    • https://cdn.shopify.com/s/files/1/0438/2353/0141/files/kupenoxosipitebaveruved.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/duvawufuzolumezono.pdf
    • https://cdn.shopify.com/s/files/1/0436/0490/2045/files/24463273585.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/85471861493.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/26197241045.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/sufijavutevesunade.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/pobomizufafiravumuzudemo.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_off0000822d.bin
0b34fbb773887d2a8bfd1f2e8869db8bc2e40f42bb368e8dcfa83928dd07a09f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822D 5700 bytes
font_01_sfnt_off000095a1.bin
6af754e1aef244f804cd5dfe8c8c6050d092f5ca68570a0b8e16756c0aee5b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A1 10240 bytes

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