Malicious PDF — malware analysis report

Static analysis result for SHA-256 878d43344ed8814c…

MALICIOUS

PDF

48.1 KB Created: 2020-07-08 23:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c839f7f5a567f6f43e8d549811448758 SHA-1: 5e25e990067bcfddbd30107171a52548631197c7 SHA-256: 878d43344ed8814cdbe34eae4f01e91b8478c9dc7140973562c4dc4ca7446cff
212 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO poisoning attack, embedding a large number of links to external PDF documents. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Dropper.Agent. The ML classifier also strongly indicated maliciousness. The embedded URL `https://ttraff.cc/wb?keyword=arden's%20theorem%20pdf` is likely the initial lure, leading to further malicious content or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9218344-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9218344-0
  • 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/wb?keyword=arden
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.pdf
    • http://files.bjscholarship.org/uploads/1/3/1/8/131871414/todak.pdf
    • http://files.ccmooresville.com/uploads/1/3/1/3/131381819/tanupip.pdf
    • http://files.bbawakeblogs.com/uploads/1/3/1/4/131437268/66807.pdf
    • http://files.merrifieldseminar.com/uploads/1/3/2/7/132710655/7749287.pdf
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdf
    • http://files.wordsplusthoughts.com/uploads/1/3/1/1/131164351/liwovemovagonam_xafon_gabenanadigulu_xupakigefasofib.pdf
    • http://files.exmouthcaninecentre.co.uk/uploads/1/3/0/8/130874128/jenasaj.pdf
    • http://files.carriecorebodystudio.com/uploads/1/3/1/4/131437454/2773818.pdf
    • https://womaserimew.files.wordpress.com/2020/06/22080855257.pdf
    • https://jutalobo.files.wordpress.com/2020/07/14824022355.pdf
    • https://simipoleguw.files.wordpress.com/2020/07/31785579653.pdf
    • https://datefakifeba.files.wordpress.com/2020/07/demaxelesaxelepep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b9.bin
4d787baef20c66d23dc071c793b1e2c6dd2cdefbab55b2be8bf9c6ac0a701c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B9 4800 bytes
font_01_sfnt_off000078d6.bin
2a4ac86d3bda5ef92594ae67dcec1dea36249c4c645da2feb22a36a2923ddf5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D6 10612 bytes
font_02_sfnt_off00009d5c.bin
3b5d6a5e18764a83e000b984417a7ead5370169c5072795cd41614a36f0f0b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5C 16360 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.