Malicious PDF — malware analysis report

Static analysis result for SHA-256 815279acec3fdc46…

MALICIOUS

PDF

44.0 KB Created: 2020-08-24 10:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd4358df336954ec88e8d5121eb4bd4 SHA-1: 5134a0c3dd8c594410c7cde002856b3c1beb5333 SHA-256: 815279acec3fdc46e9c72e2416cdc168074cb73567558c7711223f20e5014b58
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to interview questions and the malicious URL itself, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external links points to an attempt to lead the user to malicious content.

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=analytical+skills+interview+questions+and+answers+examples
    • http://waves.usaskpam.com/uploads/1/3/1/1/131164573/0a439d119ee75.pdf
    • http://files.gracetonchurchofchrist.org/uploads/1/3/1/6/131606128/vekazaloxafamo-gozerinax-zimubisadezixij-zebuz.pdf
    • http://jamef.quantrylaneart.co.uk/uploads/1/3/2/6/132681862/a2b2f88.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0149/4178/files/guwelediraxurazaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/8089/2057/files/mapamundi_politico_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/39812574943.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/sujabideluxewupujemesafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7748/files/7382006467.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/63581354458.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/29311285760.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/rofuwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0181/files/88545687114.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_off00006c8c.bin
15986ee4618abf25207f9d3d65bf3cf4029a6139feda50efa12590dc619cd60c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 5720 bytes
font_01_sfnt_off00008004.bin
b6658d83b7e4241b298779ddfc443be624ef8e9ede7a6fd3851e1e107cf19c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x8004 10212 bytes