Malicious PDF — malware analysis report

Static analysis result for SHA-256 70686e45a9171dde…

MALICIOUS

PDF

36.0 KB Created: 2020-09-09 16:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0321bb5305bbd039d6ee0c11f8c28a7b SHA-1: ae9a2246d34860e38d89bbf54643b3002dd87be4 SHA-256: 70686e45a9171dde967d56696d058f920a6e30acfadb718106e2b55c5ba47082
194 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of links to known malicious redirectors reinforces this assessment. The document body itself is heavily obfuscated and appears to contain embedded URLs, suggesting an attempt to disguise the malicious links.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/wb?keyword=jurnal%20ilmiah%20tentang%20lidah%20buaya%20pdf
    • http://files.atlancomarketinggroup.com/uploads/1/3/1/4/131437766/kirufezidi.pdf
    • http://tunaluli.tulleshed.net/uploads/1/3/2/7/132710567/jutojofamezelax-kibaweduj.pdf
    • http://rumun.privatecounsellingandmediation.com/uploads/1/3/0/7/130775565/6f575.pdf
    • http://nudexipe.bejetdo.com/uploads/1/3/1/4/131453215/274240.pdf
    • http://donura.cleansheetsmfg.com/uploads/1/3/2/7/132740763/mikivepow_welevutox_nedolida.pdf
    • http://files.altacedar.com/uploads/1/3/1/1/131164118/gatujoj.pdf
    • http://bawowepew.familypharmacywalnutcove.com/uploads/1/3/0/9/130968996/vifunal-faxixiburoka-vuvinaxe-puxunu.pdf
    • http://files.shockwavesthemovie.com/uploads/1/3/0/9/130969525/dixaselitawilu.pdf
    • http://files.corsicanamainstreet.org/uploads/1/3/1/4/131406434/jepejudun.pdf
    • http://futavofu.icusmiletoday.com/uploads/1/3/2/8/132816066/5146648.pdf
    • http://files.spiritualself-inquiry.com/uploads/1/3/1/4/131453247/5241328.pdf
    • http://piranex.alcoholdrugevaluations.com/uploads/1/3/2/6/132681513/4796653.pdf
    • http://files.kofc206.org/uploads/1/3/0/8/130813694/bapomediwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/49f5ef_3f093dc75a8540ca8f37c189a17d23ff.pdf
    • https://static.usrfiles.com/ugd/06497e_d2f86440aa9541cd97a59ebfd7aa272a.pdf
    • https://static.usrfiles.com/ugd/d54300_daee41c38888451c998e053f6088fffe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004de8.bin
98321d298558c251ad0724890667aa4d8b6857ecb2d0fb0c4bb6208b0f57a8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE8 5508 bytes
font_01_sfnt_off0000607c.bin
976759313a01d326dbebef5479426bd608866684aa701bacfbf4b31ae751fb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607C 9992 bytes

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