Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc4663d6a3766d4…

MALICIOUS

PDF

46.5 KB Created: 2020-08-22 04:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6339f1893ee079c55d746d443c24d8f3 SHA-1: 8dc5bcb1afba4ea75756cc3da6cc01a3a5eda20c SHA-256: 6dc4663d6a3766d47a45ad041801ec85a7d52c3028b0562d77bd4bbd22d7a341
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document is designed to appear as a study guide for "CCNA chapter 2 answers 2017" to entice users to click on embedded links. It contains a significant number of links, with at least one identified as a malicious redirector, aiming to lead users to harmful content. The ML classifier strongly indicated maliciousness, supporting the classification of this document as a phishing or redirection lure.

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/pify?keyword=ccna+chapter+2+answers+2017
    • http://files.thedpgp.com/uploads/1/3/0/7/130776082/9095213.pdf
    • http://files.bullnettleridge.com/uploads/1/3/2/6/132695681/jezadon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/xufamitifupak.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/88203981941.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/vehicle_transfer_notification_texas.pdf
    • https://cdn.shopify.com/s/files/1/0431/3710/6087/files/suzuki_bandit_1250cc.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/nokaf.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/ayatul_kursi_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4183/files/42075816418.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/foduzotalokakajaperolizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/18140170001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006306.bin
8079fe800254277ba8cfb836685c60261daedfca78b4b46e037802a6c492960f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6306 5140 bytes
font_01_sfnt_off0000747f.bin
96209ac7e45aaca44f8cbffe4a804502cc51f806bb703b4bafacc7a4eccbfa60
pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 13528 bytes
font_02_sfnt_off00009f5b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5B 4324 bytes