Malicious PDF — malware analysis report

Static analysis result for SHA-256 64438f55230994ea…

MALICIOUS

PDF

49.6 KB Created: 2020-08-24 20:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de337f5ec4488ebcbaa7bb15b4591028 SHA-1: d8302bb990be1e1f02ea90ac50c15813c349e484 SHA-256: 64438f55230994ea11c1f81e4008fa9a3097dfb7398ea13dbc97dbd8a888567e
162 Risk Score

Malware Insights

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

This PDF file was identified as malicious due to its inclusion of a link farm and a redirector to malicious infrastructure. The document body, though partially obfuscated, contains URLs that are part of a link farm, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through seemingly benign content to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=birthday+banner+background+images+hd+marathi
    • http://files.autopanelsworthing.co.uk/uploads/1/3/1/6/131607163/82b2c6cbd8f37d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/21359180368.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9777/files/aaa_drivers_ed_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/91297142094.pdf
    • https://cdn.shopify.com/s/files/1/0431/8029/4298/files/muwamulijewisekex.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/ielts_general_training_writing_practice_test_with_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/human_biology_mader.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/8919421158.pdf
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/op_amp_circuits_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/2938/8699/files/life_expectancy_of_building_components.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/nitro_keygen.pdf
    • https://cdn.shopify.com/s/files/1/0434/5112/1820/files/english_lessons_for_spanish_speakers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9588/3925/files/76405009036.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ba3.bin
15d8a7f4d1921a04ba948d07093892101526973f4e4f76ea7da34f43d579ab84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 5560 bytes
font_01_sfnt_off00006e5d.bin
e439a53c3defaeb62fd75d0039942cd04814b4fcf88b6e9880e62a60c3292877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5D 9780 bytes
font_02_sfnt_off00008fa1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA1 4324 bytes
font_03_sfnt_off00009da3.bin
0063e33e5f07f70915998ec3bf8a160158a3868cf5930fb2f4a5a1b1916706f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA3 7368 bytes

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