Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f0a5d8c0b666b7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 23:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6be296aa54a43038ced037e08739a7de SHA-1: eee937229613f144971e2d4e1ec0d1368a364963 SHA-256: 16f0a5d8c0b666b713d83ce8ef2930cd5e8aa52ead9cedc3b11c6f05bef9f5fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are designed to appear as benign resources but redirect to a malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the primary purpose is to drive traffic to potentially harmful or spam-related websites. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=chinese+calligraphy+practice+paper+pdf
    • http://files.devizesfinekitchenswiltshire.co.uk/uploads/1/3/0/7/130776406/lijodizivetof_wemomofiwu_nubekegezagaro.pdf
    • http://files.phsboosters.org/uploads/1/3/1/4/131438180/d894aa6088690.pdf
    • http://files.smwunlimited.com/uploads/1/3/0/9/130969313/7404020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0377/1041/files/48159527094.pdf
    • https://cdn.shopify.com/s/files/1/0439/2904/3099/files/tajakimuwupexabeto.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/23953846013.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/57178413654.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/46412061624.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/60396922269.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/23579016139.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/94887047972.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/92003909152.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/79979683167.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/jadodizajinijep.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_off000060be.bin
a0fce8a566b5283e1fbe011c2f37dad02ab7727951cfd03e0c71aedf340a6471
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 5424 bytes
font_01_sfnt_off0000732e.bin
3e1f1a65297241decf37f2d40ef32f15ed2ce5eaa3ade6ff296888aac19b7a22
pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 10540 bytes