Malicious PDF — malware analysis report

Static analysis result for SHA-256 05db41b1113cdabc…

MALICIOUS

PDF

50.8 KB Created: 2020-08-11 21:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 486b74ef9e532b3469e78290980ab527 SHA-1: c18c08bcc58414f600a5d04be4bff96c7f3c1d38 SHA-256: 05db41b1113cdabcd5f42d239059668eeb1ff34bf6d593e23938c6cc40c1e562
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service designed to obscure the final destination. The primary link identified leads to a known malicious redirector, indicating an attempt to distribute further malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution campaign.

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=data+center+architecture+design+pdf
    • http://pagutaz.uscitizenshipprepcourse.com/uploads/1/3/1/8/131856772/4866273.pdf
    • http://files.adametranslationservices.com/uploads/1/3/1/6/131637529/f274114.pdf
    • http://files.drlongochiropractic.com/uploads/1/3/1/4/131407138/bijewivoba_juzumugib_lodiga_vojafizil.pdf
    • http://files.jeffchandlercreative.com/uploads/1/3/1/0/131069824/zesosigugeloj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/vukegupowe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0261/files/35978788305.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/fewurodaxad.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/zuwivofisafadamevovanifas.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/71344867970.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/coordination_test.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/metabolism_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7541/files/jozazekakenuzunatojixagu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8693/6219/files/radio_broadcasting_script_tagalog_5_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/51784951556.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/88844521889.pdf
    • https://cdn.shopify.com/s/files/1/0435/8992/7067/files/crochet_world_magazines.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/89822689524.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_off00007a6c.bin
11c81b4401f641fa424b9e4636200c6a95ed72acab92e25da980df31f656a493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6C 5156 bytes
font_01_sfnt_off00008be8.bin
7e5a55e62cd3692b54a77d803108edebaec72ba8539a6a70fe036e95da286e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE8 10472 bytes
font_02_sfnt_off0000afb8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 4324 bytes

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