Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb14964ec678f2f…

MALICIOUS

PDF

40.6 KB Created: 2020-08-12 12:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a88d108dd4cab728161dd1863e9511 SHA-1: 2ce271a957c1639e15ba63262d5ba50de2aa697c SHA-256: 8bb14964ec678f2fd2b83ade88da9adde0b62a028da462aa9d5fc9e385839ea1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=yield+curve+risk+pdf', suggesting a lure to a malicious site. The presence of numerous shopify.com links indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the primary attack vector appears to be social engineering via embedded links.

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=yield+curve+risk+pdf
    • http://files.elenamccown.com/uploads/1/3/2/7/132712129/ruwosakedodiloku.pdf
    • http://files.texasavidoutdoors.com/uploads/1/3/1/4/131438216/nufofereg.pdf
    • http://files.cashatmservices.com/uploads/1/3/1/4/131406412/mobariwibepoton.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1834/files/rigawakojejifonelebikozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/garamadekazigipiva.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/plantas_alimentcias_no_convencionais_no_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7779/4982/files/case_interview_secrets_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/balancing_chemical_equations_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/zivujibavonepagodoxamek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/pezolamak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/ncaa_women_s_volleyball_bracket_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/remiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/51198548577.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sedafasejizal.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/tefasepisiramarorek.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/31749919357.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/marxisme_dan_agama.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_off000062c9.bin
0baf86cef473b772131c13b94cce84130536cffd368d534adb05f74535a963bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C9 5024 bytes
font_01_sfnt_off000073ec.bin
cc1f0d0056f2034588076b4a0f452fb6d2768debbc0b685d39d836ba58b88d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EC 9916 bytes

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