Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b859754b84ddaa…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 08:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc91ba9a8b7f6ca795f05f68c150c930 SHA-1: 17c7c6c98f043a6b6188505a6d585856532d1f09 SHA-256: e3b859754b84ddaa223697c4dde37a76bcff269085ddbb39032cf5e92d15434a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is likely the intended destination for the user.

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.com/wix?keyword=aplikasi+hanacaraka+aksara+jawa
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/situmubi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0486/9277/files/nageduwudozotosazomaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/gopaxobage.pdf
    • https://cdn.shopify.com/s/files/1/0433/0091/3310/files/tuvix.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/wordly_wise_book_8_lesson_10_answers.pdf
    • https://static.usrfiles.com/ugd/de3d83_5b796ec3db6c4b478bfe18767b663cd2.pdf
    • https://static.usrfiles.com/ugd/aff7ca_d1406ce58f8b405d99f0fe7a8b8b243e.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_701d71a0b76e4f458a0f74e959f6857d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/39119049871.pdf
    • https://cdn.shopify.com/s/files/1/0435/3916/9429/files/59920820287.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://static.usrfiles.com/ugd/76de1a_60db8d6965c44966b6eaf645393a60b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5e88d230c347a6a819567be00ac3b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_92bea7a586fd4e00a08e629d2fab10a1.pdf
    • https://static.usrfiles.com/ugd/1a89c8_ae11a3e58d40422ab378a4591da66963.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f6e.bin
7fb9ebc4a960f09206ebf2ecca22c0dbef037971c546b252ff920112d5a74b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6E 5244 bytes
font_01_sfnt_off0000713b.bin
ee66fda308f4143bd9c71de50ed35758d3521df1c46fed21757501e09ab67bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x713B 10408 bytes