Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be4b3313523822a…

MALICIOUS

PDF

38.6 KB Created: 2020-08-14 23:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a414a04bfde36216905506f43b968953 SHA-1: 948e7d8722709b5013f41d8c8b3e69575ccb06cc SHA-256: 0be4b3313523822ac1c061393c4fdccfd614548b1f486026ca00728011b205f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=kindle+apple+mac
    • http://banesak.designsthatfit.net/uploads/1/3/2/7/132740328/3986468.pdf
    • http://files.lvccpp.com/uploads/1/3/0/7/130738615/rugaromosivu-sapiraki-bavosesoje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/pdf_to_word_converter_app_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/64824518798.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/rewimusepil.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/kozuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/present_perfect_just_already_yet_for_since_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/9131/0232/files/rubinuguwatopame.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/xapitukekijos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/65935518701.pdf
    • https://cdn.shopify.com/s/files/1/0434/6760/4128/files/29785048851.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/passive_voice_exercises_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/user_input_in_python.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_off00005ad0.bin
9fc605b8cd3fd9f2cbb18ebae71fef5a4c9768c6bcb158f0373a5aa0a59a31ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD0 4916 bytes
font_01_sfnt_off00006b71.bin
d5c0212c997837029a60468dc509f3db27da7928a81ddc6d97f7e83e51e9302a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B71 10096 bytes