Malicious PDF — malware analysis report

Static analysis result for SHA-256 164a6d7dde8b82c6…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 16:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d036d3a9cd48d17d409794e8bda38f2 SHA-1: cfed6c8e0f797af424bfdb872bf217e0ef5d2d4c SHA-256: 164a6d7dde8b82c63ac3bb499d8ffecf36f1e7dad3eef80e691ad5db24d717d1
154 Risk Score

Malware Insights

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

The PDF contains a question designed to entice users to click a link, which is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same question and a URL pointing to the malicious redirector. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm used for SEO poisoning or traffic generation, with the primary malicious link being the most critical IOC.

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/wix?keyword=can+you+download+an+app+on+someones+phones+without+possession+of+there+phone
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/gastroesophageal_reflux_disease_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/does_costco_convert_slides_to_digital.pdf
    • https://cdn.shopify.com/s/files/1/0460/1351/3889/files/agent_d_escale_sncf_formation.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/basic_knowledge_of_zoology.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/15985033636.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/betetuxiguverixumuzapuke.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/jamujerudelodatamifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/91956313958.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5330/files/49359152974.pdf
    • https://cdn.shopify.com/s/files/1/0437/1483/8679/files/materialismo_dialectico_y_logica_dialectica.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_fbe96e0b46ef49b4a9267d10c5e9bb2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca8b31c9d3a34512a3594702ac7bedb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb3e30a7953644719d33b12a18250711.pdf
    • https://static.usrfiles.com/ugd/b8c837_235f415b5d794238838a0d95b049f254.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3280a7840346168bfa1539943b65ec.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_off0000622a.bin
5c7544ee6b0a838108565cef823d38fc5cef5fc890496977376f4bffe7242e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 5380 bytes
font_01_sfnt_off00007463.bin
aee3ef926b68ea9082e182d6e9b6248947cf1060d1fe284d36237b3c2c5a54a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 10048 bytes

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