Malicious PDF — malware analysis report

Static analysis result for SHA-256 473db0c0efbaa392…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f771d6895a0cbe7943acaea947ffec22 SHA-1: 4a38136b63b9831ec3df9cbf463466f4c1b458b9 SHA-256: 473db0c0efbaa3921a3c9bb43163fe14f85ca175c7a26fdca3abfe483d5d5fb8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.cc'. This indicates a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of numerous embedded URLs and the specific heuristic firings strongly suggest a malicious intent to redirect users.

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.cc/pify?keyword=biometria+hematica+que+es+pdf
    • http://files.casinodealerswebsite.com/uploads/1/3/2/7/132740424/3060367.pdf
    • http://nixoda.welldoneexperience.com/uploads/1/3/0/7/130776326/vexufeberepeki.pdf
    • http://files.rmgraphx.com/uploads/1/3/1/0/131070581/fenadebapabufo.pdf
    • http://files.kumalajinggasejahtera.com/uploads/1/3/1/0/131070904/648c13b.pdf
    • http://wivor.evablechova.com/uploads/1/3/0/7/130739573/buzirovo-pisojonametires-kaxidozezavok-kegazitavafumew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13002849425.pdf
    • https://cdn.shopify.com/s/files/1/0437/3869/3797/files/mizajod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/colonisation_of_australia.pdf
    • https://cdn.shopify.com/s/files/1/0433/8440/6181/files/bawipimesuzewufironoruk.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/kabegopuned.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/buketubunidosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/maxezivizawaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/biology_mcdougal_littell.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/90897254815.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/fovitanupozedelejodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/lukidubumenuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/xeparesikuko.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/ramanaxulepuludeboder.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d7c.bin
5a1e30a12fa038284853fc320c4c145445b848bb8d7fffaa9b7a448c746055f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5540 bytes
font_01_sfnt_off00007029.bin
8e5fe15150deade70fd6376f4a7c062731879bd72337a6e1c445acba920a9052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7029 11256 bytes

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