Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e1ad8ae172478a…

MALICIOUS

PDF

57.1 KB Created: 2020-08-18 14:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3001ffd1f16f3fcba80311190856ff14 SHA-1: 1af99b633091c4eedbd491edbe9d92468b0f1546 SHA-256: f0e1ad8ae172478af18f10a13c472301d70fe2dc61282f958a65f955e08d4bce
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, including one pointing to a known malicious redirector. The document body contains text related to 'Google android api list' and appears to be a lure. The presence of numerous links, many hosted on Shopify, suggests an attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=google+android+api+list
    • http://files.daviscountydoulas.com/uploads/1/3/1/3/131379042/kuxaguriku.pdf
    • http://files.memphisitcouncil.com/uploads/1/3/2/7/132710621/63957980.pdf
    • http://sedugurof.stmatthewsdayschool.com/uploads/1/3/2/6/132682883/gatizoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/27430266096.pdf
    • https://cdn.shopify.com/s/files/1/0437/0939/9192/files/naniforiwolusobidegi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5826/4229/files/gafilexetepene.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/lurekewufaruwogovob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2039/files/13913451724.pdf
    • https://cdn.shopify.com/s/files/1/0449/8921/8984/files/30211026680.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/10724586852.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41267837863.pdf
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/wogenexenarasumifufusezuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/rakokisixogavoz.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_off00008a9a.bin
0790edbc957e6ebe1832209542d40f4f251312dc67ce205e62adaa3d5305503d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9A 4944 bytes
font_01_sfnt_off00009b78.bin
9c500666e49e5bcf784ec606187355e9eb525521ccd10d9fae4a80c8b1340c53
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B78 14656 bytes
font_02_sfnt_off0000c9a4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 4324 bytes