Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f7be4d82e3c47c…

MALICIOUS

PDF

55.6 KB Created: 2020-07-31 07:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1263e7ddd4abc3b25f1e6d09aa951dd9 SHA-1: 28858897031db8dff50e61d928933eeef13db140 SHA-256: 05f7be4d82e3c47c97b062221236984e61acf6560a0cbb6c7849ea09ec94bed5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of this document being used to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=meaning+of+social+media+pdf
    • http://files.peggyshobbies.com/uploads/1/3/0/7/130775027/d5dc4815.pdf
    • http://files.woofjocks.com/uploads/1/3/2/8/132814071/mobajewagon.pdf
    • http://files.coreyrobinsonmusic.com/uploads/1/3/0/7/130776822/396689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/ravirifomunemezes.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/pakepa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/bozur.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/76232012520.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/45546184867.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/zokokedejozaxogimunixef.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/zagotaxirod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/9540073773.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/23675956421.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/ponopegupulufejevilikoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/dopabakiwuveda.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/mesofuxabowupopu.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_off00009b97.bin
1f3af4b034bccf1c28588a86438482624753bf0719502aa842539dc2b5f68b47
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B97 5092 bytes
font_01_sfnt_off0000acd8.bin
c7e0eb24f3f073ad47a651e7e00d9047c68e46dc30f719513bbbd8eaab4b7333
pdf-font-stream PDF embedded font (sfnt) at offset 0xACD8 10668 bytes