Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda4c496a105ad0d…

MALICIOUS

PDF

83.0 KB Created: 2020-08-04 17:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b940181ed3021f1bb29b746fa07aa9 SHA-1: 8031cf8630e70ca18cfa27afb4fcce5889d7551e SHA-256: bda4c496a105ad0d64b486b6b6931a3440ed7c217c0a9db282fbb8e169c85b3f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'bass guitar scales'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to known malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly indicates maliciousness.

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=all+bass+guitar+scales+pdf
    • http://files.torchpub.com/uploads/1/3/1/4/131406068/9882094.pdf
    • http://files.scriptwriters-houston.org/uploads/1/3/0/7/130776120/xomazuwutaruse.pdf
    • http://files.eagletreeproductions.com/uploads/1/3/1/3/131379868/4884163.pdf
    • http://files.riversidewoodwrights.com/uploads/1/3/1/3/131380717/vugojusik.pdf
    • http://files.lambethlarder.org/uploads/1/3/1/4/131453592/gizatilawag_gogasotefotanut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/wuxisuguvamof.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/how_to_divide_imaginary_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/totike.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/glances_apple_watch.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/muvanupadudut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/zilaguf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/26525161424.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/bedupolonev.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/21684524188.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8664/files/697887673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22584543347.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/california_dmv_bill_of_sale.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ae.bin
da39005f22153e47af49ad608137da01beb89b73fa409d52b4f2767f8d750136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 5452 bytes
font_01_sfnt_off0001163f.bin
7bb87d0ea4981bfbacc2b96d945a9367ef14a6063ed857dacacda25ce43133e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 12284 bytes

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