Malicious PDF — malware analysis report

Static analysis result for SHA-256 127ac9d5ce76bc6f…

MALICIOUS

PDF

55.5 KB Created: 2020-08-22 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 769f5e3e2ee13625e158854de03e4975 SHA-1: b65beaec8ad9984dd121f2a909376ccc64771fee SHA-256: 127ac9d5ce76bc6f2c07e13f95cb4b25d7f3ad9c180cd416dad01412939d01e0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector identified by the heuristic. The presence of many external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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.com/pify?keyword=acoustic+electric+guitar+strings+guide
    • http://zeduxi.creekboutiquetours.com/uploads/1/3/1/4/131407469/2753421.pdf
    • http://files.milfordgardenersclub.co.uk/uploads/1/3/0/9/130969131/8887440.pdf
    • http://mekenuj.clasropes.com/uploads/1/3/1/4/131406893/4605482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/for_each_loops_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/asymptotes_problems.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/70503729181.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/91932717365.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/dasiwemuzunabavivibinaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2390/9532/files/kejipurazapotowevigifot.pdf
    • https://cdn.shopify.com/s/files/1/0434/8710/1094/files/xerenolujoregeriko.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/brother_typewriter_gx_6750.pdf
    • https://cdn.shopify.com/s/files/1/0433/3099/4326/files/mewatezunidazun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/jaleti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/the_economist_true_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5240/files/christian_animated_movies_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/bayesian_inference_textbook.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_off00009b6d.bin
4ca3b1ea245a6feaf0b142e815438a0055bd2ade75039b765d742220e0d51ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6D 5096 bytes
font_01_sfnt_off0000acbf.bin
f7dacdb7fcd1705bce4b70cafaef8ee36f404d2d5aca95692ac01e2cabd784d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xACBF 10704 bytes