Malicious PDF — malware analysis report

Static analysis result for SHA-256 889c13401e0f3060…

MALICIOUS

PDF

42.9 KB Created: 2020-08-10 08:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ae7fe271cb63be2b72566edee1070d SHA-1: a7b92b2146d42d3a74cf1493acd4f45639cd79ac SHA-256: 889c13401e0f3060028ec890b1fbff3335e31445e4f1c05afe61471c400b5e75
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary malicious activity appears to be the distribution of numerous PDF files via a redirector, likely for SEO manipulation or to host further 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.com/pify?keyword=java+swing+tutorialspoint+pdf
    • http://files.joanwyand.com/uploads/1/3/1/3/131378923/5e91726e.pdf
    • http://files.soundwavesak.com/uploads/1/3/0/8/130874377/5925081.pdf
    • http://files.sportsphysioonline.com.au/uploads/1/3/0/7/130775521/texofozig.pdf
    • http://files.ukuleleclub.org.uk/uploads/1/3/0/7/130775109/gobajigufexuzakevul.pdf
    • http://files.criticalthinkingatwork.com/uploads/1/3/0/7/130776826/xofimebizoji-mafatajipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5376/0160/files/auditoria_forense_tesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/zozipimil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3658/9730/files/33476308619.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/gewazovuwatobufixuzudapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/97241995011.pdf
    • https://cdn.shopify.com/s/files/1/0452/2383/7856/files/calistenia_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/kafuwotun.pdf
    • https://cdn.shopify.com/s/files/1/0435/1305/3338/files/96566720491.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/talijofazejodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0772/files/23587139309.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/tahm_kench_voice_lines.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_off0000689b.bin
d1f3488dc76f6f4990886b704bda137f2a33a7c83558958466830c6940c82a17
pdf-font-stream PDF embedded font (sfnt) at offset 0x689B 5352 bytes
font_01_sfnt_off00007afe.bin
fa12eb4e969297104b04f96d50d902738ce6de137befca06057856f7b6af44e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 10556 bytes