Malicious PDF — malware analysis report

Static analysis result for SHA-256 335e40973079a137…

MALICIOUS

PDF

102.4 KB Created: 2020-08-21 02:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326d6394113a5f9d08e3158e990ba984 SHA-1: e28211c97c0a138caa44eb2cb17c702aafb61637 SHA-256: 335e40973079a1371db745153f9a1cd570f0a542ad2da0cf38bfb11b6a55d62c
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector, which in turn leads to a large number of other PDF documents. The document body, though heavily obfuscated, contains text related to the lure and the malicious URL. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring the user through a deceptive document to a link farm, likely for further malicious redirection or content delivery.

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.ru/pify?keyword=dog+drinking+juice+meme+template
    • http://files.manguskhan.com/uploads/1/3/2/7/132712093/dotiru_bidinofukod_tanubudetara_wesawivenisare.pdf
    • http://kutubavab.theconsciousbuilder.com/uploads/1/3/0/7/130776394/1054049.pdf
    • http://ferex.intothewild-photography.com/uploads/1/3/2/3/132302720/cd84ef63615fd.pdf
    • http://vifilixes.njsfcahh.com/uploads/1/3/1/4/131453293/ac1600c4bc91a.pdf
    • http://wemor.cheersatthepier.com/uploads/1/3/1/6/131636612/6548557.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2541/files/sadadorakoseliwarelabogoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/mazda_cx_9_reviews_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/49061562285.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7943/files/90090411061.pdf
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/angular_material_datepicker_format_dd-_mm-_yyyy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/68861013392.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/7122415501.pdf
    • https://cdn.shopify.com/s/files/1/0433/6943/1189/files/velasame.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/kugilomakezogavazekigufu.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
stream_005_off000167ab.bin
867d23ddc7eca141ee3780a35fd8c24fc24c0d872d8c52c94e36ab1ea9d134e8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x167AB 10864 bytes
font_00_sfnt_off00015583.bin
ca21d5d1933031911d439a4164dfa0e870b083a9616dfbbfd350da0d5ab491d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15583 5356 bytes