Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9fbda4aa188744…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 20:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f488762111d0a1d7d0dc9ec81a4773 SHA-1: 804f3e1bbe768a5b322f34605fa3daea63c16fea SHA-256: 8a9fbda4aa188744d80a333998df3eab9790ccd4fec5907fba6e7438fcfdffb1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Evento vascular cerebral pdf gpc' and the URL 'https://ttraff.cc/pify?keyword=evento+vascular+cerebral+pdf+gpc', suggesting a lure for potentially sensitive information or a scam. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or manipulate search engine results.

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.cc/pify?keyword=evento+vascular+cerebral+pdf+gpc
    • http://sivubod.unbridled-photography.com/uploads/1/3/0/7/130739826/751c5bf15b0b6be.pdf
    • http://files.forsythcountywomensclub.net/uploads/1/3/1/4/131452963/morinavo.pdf
    • http://files.reverieofthereal.republicofdaydreams.com/uploads/1/3/0/7/130740357/0b11dd.pdf
    • http://files.gaitor.org/uploads/1/3/0/8/130813095/5645155.pdf
    • http://files.stameliareled.com/uploads/1/3/1/4/131406804/dulitumivakoxe-lajuzof-lorepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/netikesakafinorejejefoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/9093573520.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/28652038430.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/japunolewikikogigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2510/files/zubolomonufemijunilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/mipitexela.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/art_a_brief_history_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/calendario_partite_serie_a_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/17249393251.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/75235638876.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/biofertilizers_slideshare.pdf
    • https://cdn.shopify.com/s/files/1/0440/5762/4726/files/dell_latitude_e7240_specs.pdf
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/96327765940.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/mario_bros_ps3.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_off000069e2.bin
c535ad5ea2b40ca733e76d8d61f24291b70139b0717c9ceccb778e3b45533b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E2 5480 bytes
font_01_sfnt_off00007c97.bin
d964a02f08c3400dac7830aeb5dd6077196e633dcc60731550839310536945df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C97 10304 bytes

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