Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ad9cc837232ba0…

MALICIOUS

PDF

60.1 KB Created: 2020-07-27 17:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d25d221249d863017736d2403cd961f0 SHA-1: 5305548bb9f1d6db1277b6897134da00cbdaa92c SHA-256: 83ad9cc837232ba09c706d9757ab0648204f7e9592b70e49b2e1c6c0fccff4a6
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, with many pointing to cdn.shopify.com and one specifically to a known malicious redirector at ttraff.ru. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious sites.

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=wapking+serial+song+free++2019
    • http://files.tedxunionvillehs.com/uploads/1/3/0/7/130740480/662c2982.pdf
    • http://files.graysamericanbulldogs.com/uploads/1/3/0/7/130775918/bevagokaj-sutomifirewof.pdf
    • http://files.superiormachineandfab.com/uploads/1/3/2/8/132815154/5810631.pdf
    • http://files.passoverleague.org/uploads/1/3/0/7/130739211/3583267.pdf
    • http://files.vancouver-landscaping.com/uploads/1/3/1/4/131437474/5676655.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/94593810961.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/jigowuxamimibafesopew.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/bifaruga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/nuworigavafabukegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9073/files/65567012513.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/32734842309.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/29020798506.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/susatu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/23295508544.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/manovedonigapire.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2769/files/zajolowunepiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/fadul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000898a.bin
acf0a221aef5110c0a10506a123e66ee82c723d94c09860080c1d04f68578d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898A 5336 bytes
font_01_sfnt_off00009bc4.bin
bf4c7940cb93bf60a58052a5ef2d9ba17d67f49cc6683ff007a28fb30f5f5626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC4 15360 bytes
font_02_sfnt_off0000cb79.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB79 16204 bytes

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