Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d4e4d7a2385ef9…

MALICIOUS

PDF

61.9 KB Created: 2020-08-10 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dedabd08fa70ad0e747e17a2e1a69770 SHA-1: 35811ef239e49cf6f7fe9ade8424189679e11075 SHA-256: 11d4e4d7a2385ef9023d5a012d198569a477eb2140ff36b4354647593234a6df
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector link. The presence of a link farm and a malicious redirector strongly suggests an attempt to direct users to malicious content or phishing 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=apa+citation+maker+pdf
    • http://wejesas.preengreensalon.com/uploads/1/3/1/4/131452977/rubejitabakubepup.pdf
    • http://files.sobremesasmag.org/uploads/1/3/1/4/131455543/8246187.pdf
    • http://files.coloradopricklypawshedgehogs.com/uploads/1/3/0/7/130740092/jokemebexasezupi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/gente_toxica_libro_stamateas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/50351420705.pdf
    • https://cdn.shopify.com/s/files/1/0438/8821/4171/files/jeremiah_was_a_bullfrog_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pinabazebovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/923229711.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/rurolalexatatuxogibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/how_to_create_book_in_indesign.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/39552303317.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/likijakekakixupanukurom.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/50178948215.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_off0000a784.bin
2bd369037d0e6a696e21308aeac89f2d7e1847e9000bae4e19265542ab23b939
pdf-font-stream PDF embedded font (sfnt) at offset 0xA784 4932 bytes
font_01_sfnt_off0000b825.bin
9d74d62ddbe8470c71b06085cfb85c3658c7cf350f5e42e12f248acca069228b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 10800 bytes
font_02_sfnt_off0000dcd2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 4324 bytes