Malicious PDF — malware analysis report

Static analysis result for SHA-256 134f1665e034442c…

MALICIOUS

PDF

85.7 KB Created: 2020-08-10 09:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f99b699a94cec620a1306c3ef5df633 SHA-1: 88fb93589a479c2fd0929e93243eb55064c9e835 SHA-256: 134f1665e034442ce552272d5508aec753d572276afbba86201b0c3632cd4c46
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a collection of Edgar Allan Poe books, which redirects to a known malicious domain. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malware or phish users. The primary IOC is the malicious redirector URL.

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.com/pify?keyword=edgar+allan+poe+books+pdf
    • http://depokuj.pusatbazaar.com/uploads/1/3/0/9/130969754/gexebemuxizije-kejijon-tuzez.pdf
    • http://files.collmanphotography.com/uploads/1/3/0/7/130775286/3183128.pdf
    • http://jelaze.mindfulheartprograms.com/uploads/1/3/0/8/130874284/tenesog-pobujanupajuvu.pdf
    • http://files.ouranosmarkettiming.com/uploads/1/3/1/3/131383613/9725350.pdf
    • http://files.entrepreneur-srilanka.com/uploads/1/3/0/8/130814106/sobajat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/62957489385.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1427/files/35138416314.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/42612716219.pdf
    • https://cdn.shopify.com/s/files/1/0437/1775/5034/files/diferencias_entre_neoplasias_benignas_y_malignas.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/nefujugeko.pdf
    • https://cdn.shopify.com/s/files/1/0435/7256/0031/files/86954635933.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/vepudijiwafag.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/analytical_groundwater_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/how_to_convert_mp4_to.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/jiwalodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/jadimubojowomuluvurano.pdf
    • https://cdn.shopify.com/s/files/1/0441/3181/1480/files/lefafa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/university_physics_14th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/76085958734.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/3063276919.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_off000111f8.bin
297fb0ec6340875a8da86d8c676aa9bb6f4a971d539a2087a5f51493bab89519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 5372 bytes
font_01_sfnt_off00012449.bin
4da44a83b562994fa1f94bb1880d246c745afe5408bd3280c1bfc98f17586f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 10836 bytes

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