Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1a884167bb573e…

MALICIOUS

PDF

78.2 KB Created: 2020-09-05 21:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143a9203023541e62c89ecdb1c688e9c SHA-1: 69337da11496d514a732a2f7ee288876f1ef8708 SHA-256: 4f1a884167bb573e46f693e0ba3c8af7d7581a6163a5b350164ece2608c1734c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, which is a common tactic for delivering malware or phishing pages. The document body, though heavily obfuscated, appears to contain the same URL. The presence of a link farm suggests an attempt to game search engines for visibility. 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.club/wix?keyword=badminton+net+size+in+feet+pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/chitrakoot_ke_ghat_par_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/99581337893.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/power_amp_schematic.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/vusujogejuxuvawewot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7058/files/9423081810.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/7121494157.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2726/files/99640527538.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/order_without_design_how_markets_shape_cities.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/pig_latin_translator.pdf
    • https://static.usrfiles.com/ugd/70094d_e6191720532a4ffbbe36903a487c7780.pdf
    • https://static.usrfiles.com/ugd/9c0842_24f6d53fbc62469d8984fe968f7122cb.pdf
    • https://static.usrfiles.com/ugd/16a96a_fcc5a6c010264ba89f22ec9d3887464f.pdf
    • https://static.usrfiles.com/ugd/3f0e57_6f1e8158879a4860bd03342ddecfb5f0.pdf
    • https://static.usrfiles.com/ugd/90c678_6d9015689bce40ef9980cbc23b07db2c.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5e.bin
b9a88c0589401adf5b00e62bfb5bf219d9bf56b0caceca41539e421ffe88b6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 3532 bytes
font_01_sfnt_off0000f70b.bin
dd8d9883926be6c75ff50d94256a5b3610b0d0e6762302002ef59e1b7e372d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 5156 bytes
font_02_sfnt_off00010898.bin
823f40714255930d64f5ec05c96be6a606694a12d90d21af7698233af5e3b22c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10124 bytes