Malicious PDF — malware analysis report

Static analysis result for SHA-256 623807cf8bdd51c3…

MALICIOUS

PDF

32.9 KB Created: 2020-08-25 02:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 831cb35d476edd133502b490ef876033 SHA-1: a5c76c681554672fe40091c90282f841b11cab5d SHA-256: 623807cf8bdd51c3909c6f8a6084d4fb319ba1a7facb5b9ebb2b45e35b468ecc
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body and embedded links suggest a lure to a malicious website, potentially for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

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=call+aundi+full+hd+video++1080p
    • http://woguxax.firstchristiancompton.org/uploads/1/3/0/8/130874388/bawerapuxogiz_gatebidejap_tuzebo_pozirijaxo.pdf
    • http://fapomebus.jonnystills.com/uploads/1/3/1/3/131383679/7371691.pdf
    • http://lozusan.baysa-soccer.org/uploads/1/3/0/7/130776553/zugenerixudunibuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1397/9812/files/reganifobevaramuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/gufizomomalifisekukamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/daduzexavewetulomat.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/29739705473.pdf
    • https://cdn.shopify.com/s/files/1/0428/7614/1731/files/13391853760.pdf
    • https://cdn.shopify.com/s/files/1/0447/2792/6937/files/adsorption_isotherm_types.pdf
    • https://cdn.shopify.com/s/files/1/0438/6501/4432/files/xatisolatakav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/81234368192.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/62964535680.pdf
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/rasirinerotegalif.pdf
    • https://cdn.shopify.com/s/files/1/0457/5929/9748/files/tout_savoir_sur_l_apiculture.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/editor_file_online.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_off00004353.bin
e1bc15072fda545af3ed5bde4f24f13a21af4cf8aa696f03e93617dd10d85771
pdf-font-stream PDF embedded font (sfnt) at offset 0x4353 5208 bytes
font_01_sfnt_off00005515.bin
123404dce7dc8b57cd6baae6f10c84a8be94d2f84f34a9c9f72688c5a4eaf36a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5515 9808 bytes