Malicious PDF — malware analysis report

Static analysis result for SHA-256 936e2af63e5110fb…

MALICIOUS

PDF

47.0 KB Created: 2020-08-02 09:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 084bca11bd2a43ac7431caaf2d92172e SHA-1: 72977ce0155d159290f88886ae89809c6f395aa6 SHA-256: 936e2af63e5110fb629480c074c41c8bf1a96bb3348be881e253ca1751c5da57
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to shopify domains, but one critical link redirects to `ttraff.ru`. This domain is known for malicious redirector activity. The document body text, though heavily obfuscated, contains the string 'Air crack for mac', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly indicated 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=air+crack+for+mac
    • http://files.bodyoilsbybrenda.com/uploads/1/3/2/7/132740327/ef69876e5797f55.pdf
    • http://files.victoriacoombsbowen.com/uploads/1/3/0/8/130874146/mixodubiwaregu.pdf
    • http://files.facepaintingparadise.com/uploads/1/3/1/6/131606094/8477344.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/mobewawupelusajapovurames.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/kewanee_disc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/99924688501.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/54336629265.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/10643747023.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/jogizodexo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/rofekosopef.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/ryobi_7_wet_tile_saw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/17936154931.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/14809793233.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5190/files/57407283069.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c6.bin
9a6e709885845194faa2dd4ab58a132891416f22eb92a3088561220dcb3fdca7
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C6 4872 bytes
font_01_sfnt_off0000754b.bin
32af5cfc29459d18983472b9feb3c24aaba2e300f27ea2337376c55dd43d3eb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x754B 10772 bytes
font_02_sfnt_off00009a56.bin
4f54349d39d5c42e50e756dabf051d2bfff5c53ceb403d65f0cb7486cd217ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A56 16120 bytes