Malicious PDF — malware analysis report

Static analysis result for SHA-256 60644a8bf2e94236…

MALICIOUS

PDF

43.8 KB Created: 2020-08-19 16:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 606736071d1405f728df3e47033f33f2 SHA-1: cbb6e4ad20b6394bd83fe8237fd2f6346cf88d34 SHA-256: 60644a8bf2e94236498c7c1128fa5006c231ca560be4e4dfb59d797bdbe22d39
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=serial+aimersoft+video+converter+ultimate`, which is presented within the document body as a lure for software serial keys. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the link farm behavior suggest an attempt to drive traffic to malicious sites, likely for malware distribution or phishing.

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.cc/pify?keyword=serial+aimersoft+video+converter+ultimate
    • http://dofajut.mattmonfettlaxcamp.com/uploads/1/3/2/6/132696067/2390608.pdf
    • http://nasaladu.covid19policyhackathon.com/uploads/1/3/1/3/131398285/dikemivaputen.pdf
    • http://files.numeroo.com.au/uploads/1/3/2/6/132682806/zapinuvol.pdf
    • http://files.leiydbeauties.com/uploads/1/3/2/6/132682826/zepulutifavowi.pdf
    • http://womuwiv.northburmachristianmission.org/uploads/1/3/1/4/131453060/zedepom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/talebaxoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/55449855813.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/75030099966.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/14499272722.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/jusawujupil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/nanidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/juxoxeduxirixavenafexuwad.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9709/files/5273524008.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/bksb_initial_assessment_english_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3104/files/kernel_driver_not_installed_rc-_1908.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_off000066cf.bin
3698adae7692eaa5b2d1775dbee76623963657bf8bbe691a30814e4fa6e2e8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 5328 bytes
font_01_sfnt_off000078d5.bin
877818eef681b60e20427079afb90ac5bc4354dc449d85bc7125e7562988e8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D5 13312 bytes

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