Malicious PDF — malware analysis report

Static analysis result for SHA-256 09966442b36b2791…

MALICIOUS

PDF

39.6 KB Created: 2020-09-01 21:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84e807b6d7fa0bc9cf350dd98a04d900 SHA-1: 1b5a79e646af468c137e880097ea72806dff635f SHA-256: 09966442b36b2791b6636a28a0efd09ef93bb5242c7d6a0a6f34db7e898efe2f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The presence of a password archive lure heuristic indicates an attempt to bypass gateway scanning by encrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=alfabeto+aeronautico+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/18009442321.pdf
    • https://cdn.shopify.com/s/files/1/0462/3489/4496/files/solid_black_wallpaper_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1687/files/high_count_thread_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/pikerolapeza.pdf
    • https://cdn.shopify.com/s/files/1/0462/3859/7280/files/android_version_9_encryption.pdf
    • https://static.usrfiles.com/ugd/4cf28d_e9d4461d52d5497884820eaf510355de.pdf
    • https://static.usrfiles.com/ugd/3b47cb_3aad383fbf7b4e058490731ad12c6d94.pdf
    • https://static.usrfiles.com/ugd/edb4a7_ba06480f6af444e695daeebd2e5edd40.pdf
    • https://static.usrfiles.com/ugd/a58b01_081d80bba5e4483c8a61786d89294d8f.pdf
    • https://static.usrfiles.com/ugd/65b209_f40daed6eb09404aae2e983d5201a844.pdf
    • https://static.usrfiles.com/ugd/3d0627_8a8738f5da4e4a30a98d41c34a457b7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_239acc22ba334ffe8e3a16cb4974409a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9a94e16e1245bf9f198ea971a5db30.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_off00005a93.bin
9718758642df5b22c42fce00837dca872504d6213750b4e92b3ebfa623f15156
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A93 5100 bytes
font_01_sfnt_off00006bf9.bin
86644b9246704c49159735c95e98d15d5c87fac92a489e87dbac83c843fa7768
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 11236 bytes