Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fa800075d1df17…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 15:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acfd03a75f4895c49e0b806037b39d10 SHA-1: e306786f99d7a1874c5bbeb273827ef3cf2d666b SHA-256: 84fa800075d1df17293ec2907c02921202f786fcec62ec4cef69004b8f32ae73
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded links likely serve to direct users to malicious websites, potentially for phishing or to host further malware.

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=assamese+song++dikshu
    • http://files.flagstaffstemcity.com/uploads/1/3/0/8/130873840/335a3d82dc007.pdf
    • http://noverabas.karamcneese.org/uploads/1/3/1/4/131407995/giverixagenaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/34070737916.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/wutupewajodesed.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/fonujaseredamiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/36075099585.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/wobazafoliluvojulexavupuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxedisurerikemamezawapux.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/kidusiposenisamu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/86724506273.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/62566718187.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/cours_d_anglais_gratuit__tlcharger.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/bogudijotaduwajujuwebuj.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_off00005341.bin
7b9ec5379742c176666bd5c2ce7c175ed4122de30791efbccf5e56b957b454a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5341 5164 bytes
font_01_sfnt_off000064a4.bin
2795e6668e587e4fbeeb7000af145310cfc196337c399d667c2263a38ee23a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 14324 bytes