Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea080bab1b0b2796…

MALICIOUS

PDF

34.4 KB Created: 2020-08-23 16:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34817204dd97e3a70829e263a9facffe SHA-1: 758349fbeab99038075f7673018ee43d5c1f6ee0 SHA-256: ea080bab1b0b27960bd02a51f4fda6b1e4b09f219745136a82142b6d7877d0ec
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDFs, suggesting a link farm or SEO abuse. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=mastering+the+market+cycle+epub'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and several benign Shopify 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.ru/pify?keyword=mastering+the+market+cycle+epub
    • http://xalulose.evangelistphyllisjackson.com/uploads/1/3/0/7/130776433/kafijiguvumikano.pdf
    • http://files.sasswithclass.net/uploads/1/3/1/8/131856725/bisojevaw_wukazedazili_sarizeselojudot.pdf
    • http://kipan.paschoolpress.org/uploads/1/3/0/9/130969423/1917704.pdf
    • http://files.swedesthewaytheywere.org/uploads/1/3/0/7/130775537/5081825.pdf
    • https://cdn.shopify.com/s/files/1/0449/8338/6280/files/smartsheet_conditional_formatting_parent.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/relevukaxubatubajuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/panovel.pdf
    • https://cdn.shopify.com/s/files/1/0435/2131/0880/files/antitumor_activity_of_plant_extracts.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/lapux.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/83084333494.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/rebobadexufumefinarexozog.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/69213918032.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/52276175420.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/87352698017.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/binelejalupogaloxezitoba.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_off00004834.bin
f69a41c453a35ab0fd1293b266ba455f4fec94e678d01ab77f4002e71107dcf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4834 5660 bytes
font_01_sfnt_off00005b53.bin
11db591f9385caf1e39f77ddffb9d6b2e72d0fb6d51733dd1981cb85d0c56191
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B53 10072 bytes