Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cdb5b45765e877…

MALICIOUS

PDF

44.2 KB Created: 2020-07-30 22:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fb893bebcfdfe01556a29c95fcd8dbc SHA-1: 210eb24668242a4afb375767c474e12b6957582a SHA-256: 11cdb5b45765e877b7bcd135ae5d69322c124bff961428a68b1d3500e5ebf4b0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, and another for a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links are the primary indicators of malicious intent.

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=bourree+piano+pdf
    • http://files.patriciarockwellauthor.com/uploads/1/3/0/8/130874429/xogesoku_rojenexovuro_pedub.pdf
    • http://files.babosamerebhagwan.com/uploads/1/3/1/8/131856374/pejikogonifadabeno.pdf
    • http://files.flokku.com/uploads/1/3/1/4/131408344/3a68e72dfcf.pdf
    • http://files.precisionmowerpowernanuet.com/uploads/1/3/1/0/131070313/pakebiz_pumuvukir_sivowujakozufuv_moninitos.pdf
    • http://files.beautifullyyoumovement.com/uploads/1/3/1/4/131454051/7197610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/66226077100.pdf
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/89964627810.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/1394829383.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/96303110794.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/77651714070.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/55569413430.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/82221158781.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/90771467016.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/97742927449.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/tasoguwugog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/rososejivazajidifofetegax.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_off000071f8.bin
f8ddbb3a82df9664ff42c31d3e5cba705d52bb32e4fdbd761fdd044dd6265631
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 4676 bytes
font_01_sfnt_off000081e4.bin
1866f0387476b0a9381077a5614abf84d4f5819f2b91de417d592009d1bb9ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x81E4 10020 bytes