Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39cb9ee72135999…

MALICIOUS

PDF

47.5 KB Created: 2020-07-29 03:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e537c5f16cfbe4017d89ec1cb0350a SHA-1: 916a8d9e769b8807373ba3d66a4d208bf8fc649c SHA-256: e39cb9ee72135999a0945bd8cd1d4d2d87ef1299a764da98180880e7efacf17f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be a mix of metadata and corrupted text, preventing a clear understanding of its specific lure. No scripts were extracted from this sample.

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.com/wb?keyword=present%20perfect%20tense%20ingilizce%20konu%20anlat%C4%B1m%C4%B1%20pdf
    • http://files.thecleanandsimplelife.com/uploads/1/3/1/3/131398279/kuvifamu_dipilototu.pdf
    • http://files.kaimarafghans.com/uploads/1/3/0/8/130813644/7524087.pdf
    • http://files.oriolebeachel.com/uploads/1/3/1/3/131398533/zonugowujide-berogozoxupexe-jilusazikumatoz-jedizuvolem.pdf
    • http://files.graflix.com/uploads/1/3/2/3/132303388/01215fb899fa18.pdf
    • http://files.emotionalfreedomfacelift.net/uploads/1/3/1/3/131382346/4699690.pdf
    • http://files.oriolebeachel.com/uploads/1/3/1/3/1313
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/momogixejufibitax.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/26991980993.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/folerasum.pdf
    • https://cdn.shopify.com/s/files/1/0433/1454/4808/files/golavutulenumajonanugigu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/gasefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/suremabulimavariduwaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/mudinovuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/kanemunewasogifidelotogal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/19400737040.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/mikar.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/17679625819.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/6413161352.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_off0000736e.bin
d5280192aaac9e5a19dfc421f3ca0aef9bd71e6957b18a2a43bcd8973a3b194e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736E 5504 bytes
font_01_sfnt_off00008614.bin
a58b39163644be02f532f255c4b8539c907a05de47e19ccbbfca6b32f2992d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 12676 bytes

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