Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acd1a8be78d5205…

MALICIOUS

PDF

41.2 KB Created: 2020-09-09 16:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dbc7ab39642059f25aa6beb2b5bc2625 SHA-1: f69b756d4d65d2caa9b3c6c2306da5d8d4a135e9 SHA-256: 4acd1a8be78d5205fb75567c7caf843bc0f53a9f79d617f337bfa75b114030b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, however, leads to a known malicious redirector. The document body, though heavily corrupted, contains text related to a Seiko alarm clock manual and the malicious redirector URL, indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.link/pify?keyword=seiko+radio-+controlled+alarm+clock+instruction+manual In PDF document text
    • http://files.dallasrealestatechoice.com/uploads/1/3/0/7/130739392/luziduzevat.pdfIn PDF document text
    • http://files.destinyinthedetails.com/uploads/1/3/0/7/130740123/kabavomazitis_guwisuwuwu.pdfIn PDF document text
    • http://files.autumnstewart.com/uploads/1/3/2/8/132815123/955aaa.pdfIn PDF document text
    • http://dedaz.mariannepoststudio.com/uploads/1/3/0/8/130813528/bf6d1df.pdfIn PDF document text
    • http://files.innovativemhsolutions.com/uploads/1/3/1/4/131437949/siteguxukurebi.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/1/0458/2555/6643/files/saziwodakowegevutesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2025/4375/files/nejokarofifojoxajem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9764/4444/files/kesowatirotekelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/tasmania_tv_guide_burnie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/rejonikuvelozanit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/73030811634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/48257507469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/android_studio_setup_steps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/difeso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.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_off00006340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 5284 bytes
SHA-256: ddc5827ed525debbb3c77ae65672f292b899c257d48648ffd8ccd74a39f67167
font_01_sfnt_off00007529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7529 10076 bytes
SHA-256: 2719ec4ebc1c2a0fd3d04746d3de58d26464e1ade88770847bde06c8dc0d32ca

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