Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed517f6f576fa7a…

MALICIOUS

PDF

40.5 KB Created: 2020-09-30 05:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a572aab3aa7b1870c6870b359086792c SHA-1: b97adb482aa97125f7c833401dc1940f825d25aa SHA-256: 3ed517f6f576fa7aa9e4e90fdc6d2127bdd92605e6f246c550744a6a50152cf2
154 Risk Score

Malware Insights

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

The PDF document contains a lure related to "accounting basics" and embeds a significant number of external links. One of these links, https://ggtraff.ru/strik?keyword=learn+accounting+basics+pdf, is identified as a known malicious redirector. The presence of a large link farm and a malicious redirector suggests an attempt to lead users to malicious content, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://ggtraff.ru/strik?keyword=learn+accounting+basics+pdf In PDF document text
    • http://files.motoworxiow.com/uploads/1/3/0/8/130873946/teporaruf-sedavo-kekuwexesuw-dilovox.pdfIn PDF document text
    • http://gonis.smmssilverteam.org/uploads/1/3/1/1/131163774/3960077.pdfIn PDF document text
    • http://files.reachhigheraugusta.org/uploads/1/3/0/7/130740033/nidinawitugal-busus-kozudebonad-dalese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/643bdba3-20af-4111-b845-e9a566c1b24f/juvanagoroja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7001e9da-9a01-40a8-a846-3eb97d9d6862/woxafaxabesevapiraleruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9178e75-319e-4cf9-baf0-4ee2eebee357/7945762508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a160a1-0b32-44ec-9555-bebc4f17a931/taluseweso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e95a445-ff36-4200-9a15-5946ea4668b7/52668759324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e27756e-9b70-4db7-b50a-6db31e65fea1/23563741426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4045e4-d6c4-4a4a-ab0a-4bc399fd3e9c/56993261792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda47c45-3ae4-49cc-8e5c-03832d661573/pukerutadut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e760462-5e32-44a1-957c-6b0c9362e0cf/49909263056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e572a9-6b06-4ca9-b521-4c57eeeb4c89/81520023384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3c449e-83e6-406b-87e8-a439939cf05f/55211713510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f008b17c-987a-4f72-abbb-4eb369f0a33a/kamutovuseze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2ae283-3772-47c1-9002-cd8ce2835147/komamixuregikagenewigo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEE 5372 bytes
SHA-256: 82b966c20e7091b06604ac799950df9aa801b68381283c90abec3acdd144dee2
font_01_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 10324 bytes
SHA-256: 1ed07e935396fc6474f31638f49f228f698c77bec84e980af5035f05e8d48e59

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