Malicious PDF — malware analysis report

Static analysis result for SHA-256 f623ebfe84418c79…

MALICIOUS

PDF

48.3 KB Created: 2020-08-18 15:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda0edcfaddc539f2ff6e64b0fb85bc5 SHA-1: b4f74e73cb0bc801e19e1ae3867e2fec6fc52a70 SHA-256: f623ebfe84418c79b7619a218bfccecab93a8a0ff5da78130fe531e1f65ae2b1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, such as 'ttraff.ru'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to potentially harmful content via these numerous links.

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=altium+designer+pdf+tutorial+full
    • http://files.r2wnt.com/uploads/1/3/0/7/130776089/musapuduxu.pdf
    • http://files.rooseveltelementarypto.org/uploads/1/3/1/8/131857914/569dd39a6f.pdf
    • http://nogat.goyevillage.info/uploads/1/3/1/4/131482995/mopajevirod_wodolidiruleno_tudilo_kemigexon.pdf
    • http://files.hoawindemere.com/uploads/1/3/1/4/131456012/4971878.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/vivipuzomafe.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/88672818723.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/eugene_bozza_badinage.pdf
    • https://cdn.shopify.com/s/files/1/0434/6599/8501/files/55712153161.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/java_platform_jdk_8u60_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/70058326547.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobuwavidojanunixi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/redaduxetozetamir.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/velitesabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/nutewuzif.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/xekupofitabidaso.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/satellite_kevin_gates_download.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_off00007f4b.bin
0bf86fbf8803f1ec5db5c0c458d48c833b41b67fad9920786ada4eeab06b2963
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 5348 bytes
font_01_sfnt_off0000915c.bin
b3489457d525dc23e436c36f7dc032244b930f56bed42907befffcf1338a7dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 10144 bytes