Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee557b9839e81d78…

MALICIOUS

PDF

50.6 KB Created: 2020-07-10 20:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa3551e2d85c80fbc13ddc60c770684 SHA-1: fb2a11a857868e1475fb07221b41466ba4222c8e SHA-256: ee557b9839e81d786bc1cda7a084a25b96aeca8a4c99f40eddd85bb177fee073
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting.

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/wb?keyword=pliska%20introduction%20to%20mathematical%20finance%20pdf
    • http://files.heartcentredhealing.org/uploads/1/3/1/1/131164012/944e5.pdf
    • http://files.atohmit.org/uploads/1/3/1/6/131636728/toxerij_dipotunobiwo_jobuxedewisilu.pdf
    • http://files.elcequestrian.com/uploads/1/3/2/6/132695874/kifoxifako.pdf
    • http://files.guesshowmuchiloveyoujewellery.com/uploads/1/3/1/0/131070612/vexaxip.pdf
    • http://files.centralflhomeeducationservices.com/uploads/1/3/0/8/130813546/468097.pdf
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdf
    • http://files.ctodesign.com/uploads/1/3/1/6/131607522/tazonab.pdf
    • http://files.mrgshouse.com/uploads/1/3/0/9/130969603/3356916.pdf
    • http://files.northernnevadaclassicscarclub.com/uploads/1/3/1/3/131398000/4886251.pdf
    • https://rebadatewi.files.wordpress.com/2020/07/superejoxusem.pdf
    • https://lavesuv.files.wordpress.com/2020/06/96642335485.pdf
    • https://gilolizoka.files.wordpress.com/2020/07/nonivazewuji.pdf
    • https://fekebirap.files.wordpress.com/2020/06/lufadub.pdf
    • https://rowejarenak237226416.files.wordpress.com/2020/06/3594262201.pdf
    • https://nudorofeg.files.wordpress.com/2020/07/bonozotelu.pdf
    • https://wazipugakor.files.wordpress.com/2020/06/zerunupepikesosumilesul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.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_off0000867e.bin
43ca623b877a0f34a37aa64010118dc5a87cee68f61fa6a94d573c384dd66b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 5344 bytes
font_01_sfnt_off0000986a.bin
e6fd06159ff8b89a1b85f770320e7b979196d9849eeb13fbf3d54280fa3c7ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0x986A 10708 bytes