Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b9998d3f7c02d8…

MALICIOUS

PDF

43.9 KB Created: 2020-08-23 19:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ec5471ee2b902a1335f9ae5d2c87bd SHA-1: 2f7345c07f38cc8464f5dbbb0ede0e07e2f03c62 SHA-256: 88b9998d3f7c02d88f386b77d4de28c830e03fb3c7326989083a5d18218910cc
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting a phishing or scam attempt. The embedded URLs and the document body's text indicate an attempt to lure users with promises of free applications. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirection to a malicious site.

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.ru/pify?keyword=best+free+airplay+app+for+android+tv
    • http://files.nourishe.co.nz/uploads/1/3/0/7/130776268/579234646467b9.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • http://files.unitedmissionsofhope.org/uploads/1/3/0/7/130738621/gujojomag_welabij_zijazamakap_salaxofu.pdf
    • http://files.impactliberiamissions.org/uploads/1/3/1/4/131482821/fakapakonobiles-gakigijo-bofov.pdf
    • http://files.zndaughtersdance.com/uploads/1/3/1/0/131069781/dc19de7df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/1296/4772/files/sibolezozakezibununir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/80418012130.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/fungsi_pendidikan_islam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/limojarizono.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/mojotiborolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/71548427195.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/45340397110.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/movudiwusava.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_off00006d4a.bin
8c81d48d536a551e39860867ffae8cae18c24f9f94406ea261f24c1159a20c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4A 5244 bytes
font_01_sfnt_off00007f3b.bin
cdb02cfde4575a18bc301d9415463d2d27bff9989c04a6ba34caa011e709dbc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3B 10384 bytes