Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bad60986bcb245…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f649b42d292386d88dbae25b720611f6 SHA-1: b2657a243c0e87677dd92ce52d49038ab6382d9d SHA-256: 08bad60986bcb24517438fe091e7310b65cd18470c0ad93981c207b52f7720c2
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'free pdf' lure, and the presence of embedded URLs indicates an attempt to redirect the user to external content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=things+i+wish+i+knew+before+marriage+free+pdf
    • http://zepod.surisreno.com/uploads/1/3/1/4/131482952/vidodakozera.pdf
    • http://files.triangleentertainmentagency.com/uploads/1/3/1/1/131164211/tewegajixov.pdf
    • http://files.rosewoodtrading.com/uploads/1/3/1/4/131437680/nabofukaxovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/lexopabevaroxunisevepon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1637/1867/files/mifavebumoledisutomoxemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/99380388875.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97242885008.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6472/files/45265920268.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/jiwurone.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/26678134709.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/ralewibosaronatug.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/zuzetenusesusoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/36438170010.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/25208252263.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/pojusomerevuweb.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_off0000663a.bin
ffff0c3a7d0ccc74a49d9a42bc047976f728d80aa5581fb48e4024e6dc5a18ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663A 5668 bytes
font_01_sfnt_off00007956.bin
c2e08182b4383307a5584c7ce6fbe782687dc4412cd8abf8b6ee2f9bea2be984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7956 10260 bytes

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