Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1b533f9e3eeb5a…

MALICIOUS

PDF

77.9 KB Created: 2020-09-09 16:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 614dabe16bfa29e06b788495adeadf83 SHA-1: 05da4fc3066e89bc2b3be01b28c7df92d2485c79 SHA-256: 4f1b533f9e3eeb5a977bb740460846d1d8e1930a818a5048df1f1f6a1c0395b4
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious sites. The embedded URL `https://ttraff.club/pify?keyword=decimalformat+java+no+decimal+places` is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack.

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.club/pify?keyword=decimalformat+java+no+decimal+places In PDF document text
    • http://mufanes.shopcvonline.com/uploads/1/3/1/3/131383657/sudenazufon-dibomavasej-numunag-tiduwev.pdfIn PDF document text
    • http://files.brewhouseboutique.com/uploads/1/3/1/0/131070336/5490711.pdfIn PDF document text
    • http://files.androtitle.com/uploads/1/3/1/4/131483148/bamogigaluvafog-kavivumokat-tagafodafijagoz.pdfIn PDF document text
    • http://files.wanderlustironworks.com/uploads/1/3/1/6/131606396/velerefikudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9509/5451/files/advertising_manager_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0528/6296/files/73435405168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/wojikaxibeditemap.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/db80c5_41bd86915d0b471ca2e92eb2b8a91aab.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a8cc01_752c47cf67fc4c05ba7faff0895958b6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/18122d_fbf3fe33ab884213a35f205d424d07cf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0049ca_4fc171405b8d444faa0053962f77bb83.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/6752/3491/files/15678355630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/samuwibokeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9675/1774/files/7824746630.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5436 bytes
SHA-256: 6e534a14e85dcbc180f5721e3d5ea01e6c49d44ad2380504ecfbc349d978adc9
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 11156 bytes
SHA-256: 8290f8d41269e724e4f13bb81047e353dbee59092d0414b65b8e537ab73e7fa9

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