Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c773112220aa436…

MALICIOUS

PDF

41.8 KB Created: 2020-08-04 15:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d7eb3e0aa29b591fd5316d30f6a17eb SHA-1: 6a986a26202d031bf726dab9f6f3a01a3602d209 SHA-256: 8c773112220aa436081cf9b3601b2de3ef086388afa8e40b5dd707122d6f0419
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a redirector service (ttraff.com), which is flagged as malicious. The document body, though partially corrupted, includes text related to 'advantages and disadvantages of using social media pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm heuristic. 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.com/pify?keyword=advantages+and+disadvantages+of+using+social+media+pdf
    • http://files.milbscoop.com/uploads/1/3/1/4/131454791/lonumaj.pdf
    • http://xigopob.icptraining.co.za/uploads/1/3/0/9/130969368/wowevipagitepor.pdf
    • http://files.becomingacosmiccitizen.com/uploads/1/3/0/8/130814644/notekep_kiburuzomizulo.pdf
    • http://files.labellaglo.com/uploads/1/3/0/7/130776599/ad9682f0b7bb.pdf
    • http://files.sevenoaksyouthcouncil.com/uploads/1/3/0/7/130738701/8931061.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/kolevadugewumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/togazuxefo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/bumuma.pdf
    • https://cdn.shopify.com/s/files/1/0436/8701/8649/files/wamidefubijibivotif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/xifedelurariroruwanaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/mukurivozaxibegilotuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/71681087343.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/gomovozirobibujura.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/sozejeziladodarewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/xowuvaxugi.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_off00006470.bin
6d81ff82ff2732f506a88c12d64fb130bb36aec792a5489d1d3f838ea0ff0fef
pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 5428 bytes
font_01_sfnt_off000076eb.bin
6a170046c349b073aa61b232c28f151cc30c13473fabb07034d2ab7819b81b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 10356 bytes