Malicious PDF — malware analysis report

Static analysis result for SHA-256 21148e7bd5d72494…

MALICIOUS

PDF

40.1 KB Created: 2020-08-25 16:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8066fd68f2aae2aaf48b81156df3653 SHA-1: 78fa0bdd63c1b130608f07f78a5a6dd5ec48ed7b SHA-256: 21148e7bd5d7249497c6680dcf4a415f2389ea4d2724461508d4217cb727996d
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=adobe+acrobat+pdf+editor+cost', which is designed to lure users into clicking. The document body also contains numerous embedded URLs, many hosted on Shopify, suggesting a link farm intended to distribute further malicious content or phish for credentials. The ML classifier 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.ru/pify?keyword=adobe+acrobat+pdf+editor+cost
    • http://figenipe.ddjohnsonassociatesllc.com/uploads/1/3/0/8/130814579/1931964.pdf
    • http://fatijikad.hartmutausten.com/uploads/1/3/0/7/130776167/dababejowob.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/98303464805.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/cambridge_igcse_mathematics_core_and_extended_revised_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/64805901868.pdf
    • https://cdn.shopify.com/s/files/1/0433/6890/6906/files/bowopijogos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/gagesezigomeninixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/dokupupigaxene.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/physics_james_walker_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/xepadosozoboxiso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/galidanuvekunenuniror.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_off00005e6d.bin
c343ee52f842f16996b2baa2be275f0556415cc805cebb40aba72b95c73c2e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6D 5248 bytes
font_01_sfnt_off0000704e.bin
b8c3e65af66208573e3ea159884535dfc1b25724389562d09b13ef494772a0c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 10364 bytes

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