Malicious PDF — malware analysis report

Static analysis result for SHA-256 712f19f6b14b1a50…

MALICIOUS

PDF

46.4 KB Created: 2020-08-29 12:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16935a83e6c00b4eaf3ec13f1f20e0b6 SHA-1: 650ae54c88d017636675f48abf570f5b2275e28e SHA-256: 712f19f6b14b1a508b95257c740943b10e2996f18bc94eea0a9fcb30a38fd4b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with the primary URL `https://ttraff.com/wix?keyword=calculo+perdidas+insensibles+en+paci` identified as a malicious redirector. This suggests the document is part of an SEO spam or phishing campaign designed to lure users to malicious sites. The presence of numerous links, many pointing to benign PDF files, indicates a link farm strategy. No scripts were extracted, but the embedded links are sufficient evidence of malicious intent.

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=calculo+perdidas+insensibles+en+paci
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_8eb2440e10ba4d5e934fdd1a8e77b6a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a87aba0e8764feda54d5ba9866ba59c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9861b9e5a22748e091115c8e140b1ca8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c61683f92c448ffbc5ad1544175c248.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/can_can_piano_easy.pdf
    • https://static.usrfiles.com/ugd/b8c837_1074e07e95a047e0bbf8a828a259661f.pdf
    • https://static.usrfiles.com/ugd/b8c837_55f1ad6a43b3409a855c7a4d5c45d363.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/93448983506.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/rijubuxogiraji.pdf
    • https://cdn.shopify.com/s/files/1/0463/2562/9085/files/luwurupufawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/31345843919.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2965/files/update_button_in_html_form.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_off000066cf.bin
9513b1c0c105203b1d562d0ce6b378f08cff3e1a52d65182f7d2ff8da2594559
pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 5032 bytes
font_01_sfnt_off000077e0.bin
ff0e78554bac0df204d035d049775242242fc8e1d1b4c314a6e48b8524eb37df
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E0 11160 bytes
font_02_sfnt_off00009c63.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C63 4324 bytes