Malicious PDF — malware analysis report

Static analysis result for SHA-256 655a4cb1de99f60f…

MALICIOUS

PDF

55.9 KB Created: 2020-08-05 14:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c084e27ee97f679d3220df80a31408fc SHA-1: eccce6be34ddc4af91471fda64bfc2db186376ed SHA-256: 655a4cb1de99f60f1d03435842a6b7460be8a262c527e31df2dbc4d5d8399517
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Bayesian statistics in r pdf' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or 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.cc/pify?keyword=bayesian+statistics+in+r+pdf
    • http://files.oregondyslexiainstitute.com/uploads/1/3/1/3/131380397/muwezivamogi-wewodanasopok-lagolisusavemug.pdf
    • http://files.naturegreenleafllc.com/uploads/1/3/0/8/130874085/zegoxog.pdf
    • http://latav.yarramlandcare.org/uploads/1/3/0/7/130739664/28b71d1.pdf
    • http://files.welcometothegreenroom.com/uploads/1/3/0/8/130874361/553377.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/dwg_viewer_convert_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/wulatojozavasigaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/78681372189.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/10329896364.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/92548122752.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/61954977229.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/pugazaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5109/files/xezojup.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/81995714276.pdf
    • https://cdn.shopify.com/s/files/1/0438/8788/6488/files/27128402714.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.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_off00009e40.bin
48a488017b41b2d4f4b835dbc5c5f90eec07980536479863098801651714f039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E40 5268 bytes
font_01_sfnt_off0000b043.bin
d331b4cb0ccdf89a7b8f2f18b4160c544139538ea77ea6287e2851959d8bb4eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 9980 bytes

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