Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcbe110bb7ac6b4…

MALICIOUS

PDF

44.9 KB Created: 2020-08-10 15:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7eab8b5cf57e5a429bb1b5eae8744b SHA-1: 65ecc6d9439e5c2adcc3aa27cf9342e6c8d850b9 SHA-256: 5dcbe110bb7ac6b4835cb5358cee6d4a677a3ef31f0e7ed2896e284f6bb2c833
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link redirects to a known malicious redirector infrastructure at 'ttraff.ru'. The document's content, though obfuscated, appears to be a lure, and the primary function is to drive users to click these malicious links, likely for phishing or malware distribution.

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=sample+business+letter+format+example+pdf
    • http://files.rvasings.org/uploads/1/3/2/8/132815178/45c615b5f.pdf
    • http://files.sonomagrilleandbar.com/uploads/1/3/0/7/130740143/2931018.pdf
    • http://files.petrapreschool.net/uploads/1/3/1/4/131454262/314fdf.pdf
    • http://files.starfishswimmers.com/uploads/1/3/2/6/132681992/rumopi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/31630797236.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/74085283354.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9648/files/wibadufezez.pdf
    • https://cdn.shopify.com/s/files/1/0430/4764/9429/files/lewotuzom.pdf
    • https://cdn.shopify.com/s/files/1/0431/1636/3927/files/xijokiruvub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1664/9890/files/biological_science_freeman.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/calorific_value_of_fuels.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/73140228589.pdf
    • https://cdn.shopify.com/s/files/1/0434/8303/7860/files/mulopotenaxolovi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/64637128652.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/rarexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/20258932989.pdf
    • https://cdn.shopify.com/s/files/1/0432/0418/2173/files/vupivujukitiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f2.bin
7343f38e130c663bd596fed6da6840c07545a9a9ed859aaa907fc50240ca4160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F2 5380 bytes
font_01_sfnt_off00007515.bin
506949894be8aadd483cef6c003ace01f50a8cd8c15fe132f4cb54d4d2926f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7515 10236 bytes
font_02_sfnt_off00009807.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9807 4324 bytes

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