Malicious PDF — malware analysis report

Static analysis result for SHA-256 e775e45216fa1323…

MALICIOUS

PDF

43.8 KB Created: 2020-08-14 10:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c011ac814b95abe19a223e3ed9de5e SHA-1: b623d9225077124c6e0337a1f5d226e98184c9ea SHA-256: e775e45216fa132349e6fefb17523fa6c3bacae0629d99da90f8e196f42cdab0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.com/wb?keyword=gestalt%20unfinished%20business%20worksheet', which is also flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm intended to obscure the ultimate malicious destination. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious URLs.

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/wb?keyword=gestalt%20unfinished%20business%20worksheet
    • http://files.canyoncitygrill.com/uploads/1/3/0/8/130813765/desikonogege_xakuf.pdf
    • http://files.burmantoftscommunityprojects.org/uploads/1/3/2/7/132710756/pasulixox_nutodomid.pdf
    • http://files.faithcomethbyhearing.net/uploads/1/3/0/7/130740249/2043357.pdf
    • http://files.tinforestfarm.com/uploads/1/3/1/6/131607063/salevozezigewod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/kulemuvizufinutipepi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/vimupiva.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2115/files/28284936487.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/oleo_calendula.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/kisumorezepato.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/nekotoxesurawazoxugifo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/zagifetagazosuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/endangered_species_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0435/8442/2051/files/bridal_hair_and_makeup_contract.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/fegirilulabiduxixixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/714218511.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_off00006ef2.bin
7b0fa932606ac7a032be1e55d8ce3c99bc43a4f5929df3a491780771478ae874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF2 5324 bytes
font_01_sfnt_off00008112.bin
b41e502127510fc31fa99bf3c1a37d04d94afaa9cfa8c6adf89d7ddbbc5cf65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 9792 bytes

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