Malicious PDF — malware analysis report

Static analysis result for SHA-256 768a309526f286fa…

MALICIOUS

PDF

56.9 KB Created: 2020-08-21 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec51c2b0abbd27d7d533f08eb498c6b5 SHA-1: d5e98529d7b16f5d493f69b4695fc1025483ead8 SHA-256: 768a309526f286fa772e500133541acfa740f5dcc17e0666c3e6aa70ba32e3d4
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 heavily obfuscated, contains text related to 'Facebook app for windows 10 apk' and references to the authoring application, suggesting a lure for potentially unwanted software or phishing. The presence of a malicious redirector indicates an attempt to lead the user to harmful content.

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=facebook+app+for+windows+10+apk
    • http://files.obsidianleague.com/uploads/1/3/2/6/132681647/7757317.pdf
    • http://files.faithchapelberlin.com/uploads/1/3/0/7/130776433/3139115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/napijibenudivuzuxuvusula.pdf
    • https://cdn.shopify.com/s/files/1/0439/9605/3662/files/87846105437.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4250/files/5469105024.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/55436548549.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0012/files/android_tablayout_set_selected_tab_position.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/82176259756.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8418/files/java_programming_examples_with_output.pdf
    • https://cdn.shopify.com/s/files/1/0437/8899/2674/files/texas_comptroller_reports.pdf
    • https://cdn.shopify.com/s/files/1/0447/0043/4586/files/akuntansi_manajemen.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/balao_magico_minha_mae.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/15451211335.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6991/files/goodman_service_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/automann_suspension_catalogue.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000883d.bin
1171a3906a0beaea5fe7a84f63e863f26b1ad9942427501780fa49f401b8a7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x883D 5268 bytes
font_01_sfnt_off00009a39.bin
e757def2f5c69f29e7af8d753afa2131ba456c93cbeabbcf31da2ea26eff8384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A39 14840 bytes
font_02_sfnt_off0000c8ad.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 4324 bytes

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