Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a8c26f4d5c1474…

MALICIOUS

PDF

49.9 KB Created: 2020-08-19 06:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57064249e8cb2ea7fa51cd9582297a99 SHA-1: 7a29caca5cbff0934fa938483bd109cc35216984 SHA-256: 11a8c26f4d5c1474da96dd4b2d43814068f9ed0e8accff8c0b7733b00c7a6030
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, though heavily obfuscated, contains text related to 'manual testing aptitude questions and answers pdf' and includes URLs that likely serve as lures. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful 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.cc/pify?keyword=manual+testing+aptitude+questions+and+answers+pdf
    • http://rujur.tyrellheaton.com/uploads/1/3/1/0/131070420/87ab9.pdf
    • http://files.bendingsolutions.com/uploads/1/3/0/7/130740112/82f6c867afd5bd.pdf
    • http://files.kunagoldparents.com/uploads/1/3/0/9/130969211/6d052e.pdf
    • http://nojiwu.mariagmaas.com/uploads/1/3/1/3/131379578/8550346.pdf
    • http://files.mowmylawnonline.com/uploads/1/3/0/7/130775969/39394aca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/10803314479.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/43795908922.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/possessive_pronouns_in_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/91124586636.pdf
    • https://cdn.shopify.com/s/files/1/0445/4046/1220/files/advantages_of_renewable_energy.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9073/files/30739424698.pdf
    • https://cdn.shopify.com/s/files/1/0453/2790/9019/files/35664838096.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/budismo_esoterico_japones.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/microxp-_0._82._iso.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/zolitigisudugiwide.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_off000084cf.bin
3915548019fe02e922fad4d44b5ff1f1b21b1e1720c08ff3d30b5cebae169621
pdf-font-stream PDF embedded font (sfnt) at offset 0x84CF 5432 bytes
font_01_sfnt_off00009766.bin
d04ad7536e8c502aecaf3911383e63457d14c60055816897b23f9d04c467ccdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9766 10308 bytes