Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ba82480dd27de0…

MALICIOUS

PDF

36.9 KB Created: 2020-10-30 00:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55019d90eedb9e9fe51e6591db578e95 SHA-1: 543c9e6675e910ae8704edf8b5e876a67b86ca79 SHA-256: 55ba82480dd27de0516d13db45c0f55f1b3f06f4b0d7343f4cfe0db4187ad27b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL. This suggests an attempt to lure the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, and the primary malicious activity observed is the redirection via embedded links.

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/123?keyword=sepo+y+sapo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4be1a36a-a6de-4520-a5c8-614d2408a476/87993539710.pdf
    • https://uploads.strikinglycdn.com/files/7ad51724-f36e-4ce0-92da-95e5733bc67c/82367992702.pdf
    • https://uploads.strikinglycdn.com/files/ab5e9fc0-f92d-4ece-97d5-a4da1e1ae64f/zadafuf.pdf
    • https://uploads.strikinglycdn.com/files/759b1f96-a4f9-457a-a9d5-e585a2a3f79b/18483743192.pdf
    • https://uploads.strikinglycdn.com/files/e91dd8a7-8e4f-41ec-bca6-e913a4922c53/38552077899.pdf
    • https://uploads.strikinglycdn.com/files/fe09eda5-c6c0-4255-8cd5-2e0dc318d725/44856711044.pdf
    • https://uploads.strikinglycdn.com/files/2aadcb85-b566-477a-99ec-f3b4a2a30308/22572368796.pdf
    • https://cdn.shopify.com/s/files/1/0459/9031/4141/files/32938657480.pdf
    • https://cdn.shopify.com/s/files/1/0499/0173/2039/files/piwadexodegidupogef.pdf
    • https://uploads.strikinglycdn.com/files/30161988-a28e-464c-9166-90b20b811f76/kuxadutowuzevifusabekepe.pdf
    • https://cdn.shopify.com/s/files/1/0499/1641/2072/files/wusivijenesosixuxifufam.pdf
    • https://s3.amazonaws.com/fejenijovekozu/xaxupudosuti.pdf
    • https://cdn.shopify.com/s/files/1/0479/6553/6412/files/uses_of_micrometer_screw_gauge.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_off000049f9.bin
83b89d3da073a0bd6a057951ac932e3e4b8323d43767f22b63a4c9e75970b5b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x49F9 4892 bytes
font_01_sfnt_off00005aba.bin
7cc3b07413d2897b564339a19de8361f78e62ac6d5fe44e8a041d20a06a1af3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABA 14108 bytes