Malicious PDF — malware analysis report

Static analysis result for SHA-256 1697b5f497d89f79…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 06:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d257ef71653773d29f459a7b8157b174 SHA-1: 934fb6f6ad43973ec987be930ff9bf4b8de4b34d SHA-256: 1697b5f497d89f79ed2eacee8cf996030a9ebda3f290fc64d3b13d1d3b93363e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body and embedded links are designed to appear as legitimate academic or informational content, likely to trick users into clicking the malicious URLs. No scripts were extracted, but the primary attack vector is the redirection to external malicious sites.

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=assimilation+in+phonology+pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.littlepieceofmyheart.com/uploads/1/3/0/7/130740517/aaef0f352ce451e.pdf
    • http://files.anabeljuarez.com/uploads/1/3/1/4/131452942/8b2f1b09.pdf
    • http://jibopube.dlitefulchocolat.com/uploads/1/3/1/6/131606552/kisegajagesi-jafogamot-vutapovakegimit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1916/4058/files/neural_network_cost_function.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/jibikakugumofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/24415397616.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/jakunot.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/60535627107.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/50423395456.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/98295578804.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/66007930005.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/ligodegizuwekegamegokokum.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/20023227278.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_off000063ba.bin
3f521d6753f76d6fa5ce37bc90ba858ef2b57343c44dbeb25aea272794562a84
pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 5452 bytes
font_01_sfnt_off0000762c.bin
e29c88664964b940e69b8f0f4e3758db7db5582e7c4bc193475838b632dfc4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x762C 13220 bytes