Malicious PDF — malware analysis report

Static analysis result for SHA-256 683ecba72ace9ef8…

MALICIOUS

PDF

63.6 KB Created: 2020-07-19 06:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0df4c26a78caaf744f93efaf43df51 SHA-1: 0776730ced1c1d6f744ba85cc2ec0e1b7aa851e5 SHA-256: 683ecba72ace9ef89b4042773c72283b3b97fcf51d5cf93ecffbb1c0503f1e66
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also 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.com/wb?keyword=red%20black%20tree%20in%20data%20structure%20pdf
    • http://files.fathersparentalrights.com/uploads/1/3/1/1/131164204/4902711.pdf
    • http://files.gaddyshackranch.com/uploads/1/3/2/7/132710759/vuretexop_vevixisenekox.pdf
    • http://files.barometerofalumnisentiment.com/uploads/1/3/0/9/130969562/vamopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/95750096997.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/54435152861.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/30113898315.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/19022067939.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/35387018578.pdf
    • https://kipebalaram682835488.files.wordpress.com/2020/06/turovumizukezividoji.pdf
    • https://jarajabeduxe.files.wordpress.com/2020/07/votavotezosexedej.pdf
    • https://wunugevakel.files.wordpress.com/2020/06/83585169573.pdf
    • https://zuzalafaj.files.wordpress.com/2020/07/6014497707.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/62879465212.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/jafotubigetadita.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/56557294857.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/49331653038.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/60817302321.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/34122738136.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/xuderofagut.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_off0000acf4.bin
735fd9e92ce0d9c2de9bb0c5fb3528b6ebaede4593af1633ed36da3978d718fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF4 5132 bytes
font_01_sfnt_off0000be79.bin
fe0a43afd1dc610f25b32a3279c67658602acb5a41f551ddc64dab52ea5916da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 15996 bytes

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