Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db0c577edf8c78d…

MALICIOUS

PDF

39.1 KB Created: 2020-08-14 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf5623b5d65541e907f4de570bf3436 SHA-1: c4b44a04a6961d8b104d92aec78d3007d3cf040f SHA-256: 5db0c577edf8c78dbe1a714ce1f4e0d8e373e935e0c176a75cb4bc9b8947ff13
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'ugc approved computer science journals list 2018 pdf'. The presence of a link farm heuristic further indicates an attempt to manipulate search engine results or direct users to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be directing users 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.cc/wb?keyword=ugc%20approved%20computer%20science%20journals%20list%202018%20pdf
    • http://files.firsttakeagency.com/uploads/1/3/0/7/130740092/91db25533fabd7.pdf
    • http://files.cleancurves.com/uploads/1/3/0/7/130739697/wavaje.pdf
    • http://files.jamesekdahl.com/uploads/1/3/0/7/130775245/gapiwujosona.pdf
    • http://tenidavu.mohamedjabaly.com/uploads/1/3/1/3/131380390/5dd45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/tubinosijukudewipuzad.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/list_of_new_appointments_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/bogububutepeminixiwupigi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1040/7069/files/14068592831.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/97051172791.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/antilog_table_in.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/10469458856.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/wokevekatovadekam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/elemental_evil_dnd_5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/36519012480.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/lexulitatozixad.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005850.bin
53ec623608b74f1fac8a8fab828447b1b71a6f175655349af7b2bcb70ae8f674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5850 6124 bytes
font_01_sfnt_off00006d1c.bin
8105e0461af14a4fcb5939051bac582ca77f33457105812e62e5d5448fe0d801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1C 9996 bytes

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