Malicious PDF — malware analysis report

Static analysis result for SHA-256 646fa7491aabb04e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 17:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1a88f1425993f9ed3b3622c29e951b SHA-1: 08c5c44d7e1c76cc58cdbf25ab267358b1b07a54 SHA-256: 646fa7491aabb04e6148173cd5277993e8f1e561f906403216548b45a8191bb2
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to a redirector service, which is a common tactic for distributing malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure for a "4 by 4 rubik's cube solution guide". The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation to increase visibility. No scripts were extracted, but the PDF structure itself is flagged 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.cc/wix?keyword=4+by+4+rubik%2527s+cube+solution+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/en_la_carta_cul_es_el_significado.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/99024978994.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/70555272214.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/4279029876.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/plaid_avenger_moodle.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0461/files/49922067149.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/guwuwibitulipazo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/zadafoxidemej.pdf
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/gafuxufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/75381243424.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/avision_sheetfed_scanner_av176u.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/mefujolux.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/tobabimuwubekudozesenozot.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/japutebifenusune.pdf
    • https://cdn.shopify.com/s/files/1/0431/2458/8701/files/parilas.pdf
    • https://static.usrfiles.com/ugd/b8c837_b798244337974331a7ca0fb43a6ad61f.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d62f8333df476db4b78d181843641c.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_off000068d1.bin
878f45c70a0d707f40fce605ea2c0bd11618f29495647a89a72143204ecb9262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 5232 bytes
font_01_sfnt_off00007ab9.bin
ca6a904f4f483542ad2a4ef3cc1af5a74f13a30cc55d021b7e92979af1dcb923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB9 10272 bytes

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