Malicious PDF — malware analysis report

Static analysis result for SHA-256 69691a4c022ed2e8…

MALICIOUS

PDF

33.4 KB Created: 2020-08-20 20:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 349290d9bdf5338da5c7e6cbe77e723d SHA-1: 99a3b799666e8ce295e59f8e9a77ab53647eb38a SHA-256: 69691a4c022ed2e8cf7ac40682d922ad4eb370ae534cde394a045ee9823744f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a ringtone download, which leads to a link farm of other PDFs. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a SEO poisoning or traffic generation scheme. The document body itself contains obfuscated text and URLs, reinforcing the 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.com/pify?keyword=besharam+song+ringtone
    • http://files.aroundtheworldkitchen.com/uploads/1/3/2/3/132302871/pijomaloga-bogitilagese-gefijukat-ridolexapaler.pdf
    • http://wubojala.dturnerla.com/uploads/1/3/1/4/131437079/fumofepazi_dobetakow_bawuvoj_xiseberasonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/60072187240.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/jobakamuxewurofoledeju.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/26763647284.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/87751202393.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/vigupovalamoweluvemoxixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/data_types_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/1046/5698/files/44668793612.pdf
    • https://cdn.shopify.com/s/files/1/0440/7898/9462/files/74784186147.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_off0000477a.bin
eb0dceb287f69aa694da6031eea82c875bb70c103a0d74ca9bc7b2f864c1992b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x477A 5116 bytes
font_01_sfnt_off000058c4.bin
8a7bf4c26022eefe0308cfbc9c145b01fb562d282ac5e9a1f891b3bd755baa59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C4 9644 bytes

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