Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d10621dcc78241…

MALICIOUS

PDF

47.2 KB Created: 2020-08-10 21:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9adf3c55ac1c5039fc469f9fcaff311 SHA-1: 68b3d51767526deeef2e6bd6d0a5d4f30d4fbc0f SHA-256: 88d10621dcc78241a4f0a5a3f01237a54be27ad5edf3f3bdc0679b65146beaac
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 of which point to a link farm designed for SEO manipulation. One prominent link directs to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'information security interview questions and answers pdf free download' and the malicious URL, reinforcing the lure.

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/pify?keyword=information+security+interview+questions+and+answers+pdf+free+download
    • http://werute.insightenergy.ca/uploads/1/3/1/6/131636725/6da0c528cfc4.pdf
    • http://modafi.simonetteberry.com/uploads/1/3/1/4/131453247/varasemep.pdf
    • http://dudud.hhslmc.com/uploads/1/3/0/7/130738970/pitisiwelenisejosuzu.pdf
    • http://files.shermanjewelers.com/uploads/1/3/1/6/131637147/ac9f5998cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/67209338862.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/65168224013.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/25371564808.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0434/7314/1912/files/1900772301.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/28280391955.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0432/0559/1200/files/48412916968.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/dozukavafiwefufeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/optane_vs_nvme.pdf
    • https://cdn.shopify.com/s/files/1/0437/9954/3970/files/7421598541.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1981/files/fogejede.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c57.bin
6075a59c92a7f7eb7bc190f42cbfad387de0369804f862fb1cd89e0640c04bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5500 bytes
font_01_sfnt_off00007eff.bin
6869fb7fc7c557b17da1e2703812a14294461151b61ed78663511f536a28bbe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 9996 bytes
font_02_sfnt_off0000a135.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA135 4324 bytes

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