Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b074052536093…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 12:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f5d765532657bb54730f038a42175c SHA-1: 89cb998fa98f4fcbb1f05a2d8e90ae20cb3f42e6 SHA-256: ab8b074052536093fc04735db5cbff88d870c222aaaf8ce3456e3e442dd31b16
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links, likely to a phishing site or for malware download. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific 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/wix?keyword=apple+release+dates
    • https://static.usrfiles.com/ugd/b8c837_cfcda2e4e5bd4a3d8b7503cf0da89f99.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb9e44ca385e449696d4bb10c0f6fc92.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c63312f38c64bf080af884e03bedf1d.pdf
    • https://static.usrfiles.com/ugd/73f3b0_d0b84763caa4452f86c92d2a62903a8d.pdf
    • https://static.usrfiles.com/ugd/98857b_b9a952ec7f544ccbbd11cde3dcac3462.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/77703509242.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/pusabexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/43658956099.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/rearrange_pages_in_adobe_reader_xi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6272/files/93915561452.pdf
    • https://static.usrfiles.com/ugd/b65acf_b738744b2c164cb08511c83f9118a3b7.pdf
    • https://static.usrfiles.com/ugd/0f5b72_8db7b34670784e50bc22b14f9ea8d567.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/59108951727.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/16248534742.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/jofawipokutapaniso.pdf
    • https://cdn.shopify.com/s/files/1/0459/7006/3520/files/ruxubuwotibuwozotem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006470.bin
560d63ba04f1fb3569a1a3c810537c8316a0d618effe04660f2f5c7c85cfab29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 4464 bytes
font_01_sfnt_off000073a0.bin
c1aa9cf97998ec81e53974eedf21c2db1b89e19a716a694cf3191029de269447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 12308 bytes
font_02_sfnt_off00009b51.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B51 4324 bytes

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