Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdab8759cc778d8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-13 14:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6518cb758202ca086af927e35cdf15f8 SHA-1: ce37f53699c73aadbd4f6e4e9e2f8b61a415b28f SHA-256: 0fdab8759cc778d800e7961809ac301034fc57df6871b1878a173ddbb356bee5
154 Risk Score

Malware Insights

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

This PDF was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. It contains a large number of external PDF links, suggesting it is part of an SEO link farm. The embedded URLs, such as 'https://ttraff.ru/wb?keyword=internal%20controls%20over%20financial%20reporting%20pdf', are likely used to drive traffic to malicious or spam content. No scripts were extracted, but the PDF structure itself facilitates redirection.

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/wb?keyword=internal%20controls%20over%20financial%20reporting%20pdf
    • http://wiribumub.protononprofit.com/uploads/1/3/1/4/131438477/tarupozalika.pdf
    • http://files.mscommunicationassociation.com/uploads/1/3/0/7/130738970/wojuse.pdf
    • http://files.wanderwithsari.com/uploads/1/3/1/3/131398419/rokikopumotobax.pdf
    • http://files.gradeeight.nestmusic.org/uploads/1/3/2/3/132302896/komijatajere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/somitegudasajifav.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/79905671658.pdf
    • https://cdn.shopify.com/s/files/1/0429/2388/4711/files/42541078412.pdf
    • https://cdn.shopify.com/s/files/1/0449/8666/3070/files/chad_country_profile.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/method_man_da_rockwilder.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/11563157252.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/gevevora.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/41679296262.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/16256492395.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/74537720352.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/pivenilijatawaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/23084404468.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3864/files/julek.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_off00005f04.bin
1b96f27d70d4301e4ea597495b676bbfdbaded017b4155803dcffb4d5d5e130b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 5320 bytes
font_01_sfnt_off00007123.bin
e347920f74b281955de8265751c0dd0972c7b866b11d16f3af8ed522c387c916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7123 10564 bytes

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