Malicious PDF — malware analysis report

Static analysis result for SHA-256 16125e3a43bc89fd…

MALICIOUS

PDF

41.9 KB Created: 2020-08-23 19:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dcb9e3761dfd3673d10dc9e537056b1 SHA-1: 14f85b4b26285b7b167ed585d3044baa3dac404f SHA-256: 16125e3a43bc89fdaa1d8d8b00ae26dc868b704f3a89d7b961c7101b319caf51
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a "Cydia beginners guide". The ML classifier strongly indicated maliciousness. The embedded link `https://ttraff.cc/pify?keyword=cydia+beginners+guide` is a known malicious redirector, and the document also contains numerous links to PDFs hosted on Shopify, likely part of an SEO link farm to improve search engine ranking for malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=cydia+beginners+guide
    • http://files.tilttrucksaccessories.com/uploads/1/3/1/4/131437362/9b5bb4e02b48c.pdf
    • http://files.earthsideholistic.com/uploads/1/3/0/7/130775229/9e24c12befca0.pdf
    • http://files.digirhetorics.org/uploads/1/3/2/6/132682820/xekobigokivawejuw.pdf
    • http://files.multidis.org/uploads/1/3/0/7/130739802/xaverezisituta.pdf
    • http://files.krownstl.com/uploads/1/3/0/8/130813042/zabadatajezoni-viroxosaja-dusideranagej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/sipabigaloxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/zijufebomurarar.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/63053831652.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/lesitegesebejelubewuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/bixusitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/91422328549.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/64651490555.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/75737657797.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/54923704100.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/1st_grade_phonics_worksheets.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_off00006667.bin
eb3cd6157c47cc366a896dbef8a0f335d396a29afc69ecf84065cdd6233c6f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6667 5108 bytes
font_01_sfnt_off000077da.bin
ebac13bd97122cff017848d63b728fd28f10f826fd70c482f8bd714b6c46fc45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DA 10288 bytes

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