Malicious PDF — malware analysis report

Static analysis result for SHA-256 69efd0dfb6e51379…

MALICIOUS

PDF

42.7 KB Created: 2020-11-07 00:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a96d07d0a9e21ec538182a20ac9fe0bf SHA-1: e2171b87fa28ae5f1f91ceba6f3139944a5b713f SHA-256: 69efd0dfb6e51379ecb7267e35992ad2291d4beb75c3a01ab329607cd7179ff8
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to multiple external PDFs. The document body and embedded URLs suggest a lure related to 'Google opinion rewards apk', which is likely a pretext to encourage clicks on the malicious link farm. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=google+opinion+rewards+apk PDF link annotation
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/d3dee9c0dcc.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/jaxape_wijizexuzif_penat_zalivi.pdfIn PDF document text
    • https://liforofejot.weebly.com/uploads/1/3/4/3/134350560/298c789178a33.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/xonitunusis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/sikuva/19725403954.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/30572467629.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/ella_enchanted_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/pac-12_sports_news.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/nerakigunuvorejawaji.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/zugawibumap.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/spoons_drinks_menu.pdfIn PDF document text
    • https://watupep.files.wordpress.com/2020/11/nozaxibo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/xesunerakipiberu.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAF 5312 bytes
SHA-256: e85c7846bc101988cbc2ef6c0fad64eda858eaf018e24ca77f8eb4f937b5d07e
font_01_sfnt_off000060e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E0 9088 bytes
SHA-256: 8696e767c86a5dbdcdebf7252a05ece8f7ab19e4fda0b436b195fcc8eed21e07
font_02_sfnt_off000079ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 10492 bytes
SHA-256: 7aa85f565d8b1f5c129680da4444cb2adefa58f9b5eb0fe36dd8f971449422f3

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