Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cab27914dfd1b7c…

MALICIOUS

PDF

46.3 KB Created: 2020-07-09 03:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 183b1020241c1944fff28fadf4da6b2a SHA-1: b1724a366ac07bb0ed10df6d8f42cdc95d4595ff SHA-256: 9cab27914dfd1b7c7c6f01c8c5c8ee080e6c2f8705275d80ecd385ec1f061115
152 Risk Score

Malware Insights

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

The PDF contains a high volume of embedded links, many pointing to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and contains metadata related to its creation, but the primary malicious activity appears to be the extensive link farm.

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=statistika%20pdf%20unec
    • http://files.retreataberdeenshire.com/uploads/1/3/2/7/132712163/keraf-nobowexozeborag-lujozeru-lozumipisokuk.pdf
    • http://files.citydanceolympia.com/uploads/1/3/1/4/131406433/813547.pdf
    • http://files.happycentric.com/uploads/1/3/1/6/131606674/90d3e.pdf
    • http://files.atouchofcolorbytamilee.com/uploads/1/3/1/0/131069875/punododiduxujori.pdf
    • http://files.antikapictureframing.co.uk/uploads/1/3/0/7/130775856/xavilaxawagex.pdf
    • http://files.bressefarms.com/uploads/1/3/1/6/131606819/gajugofore-riwovejodedad-lusodo.pdf
    • http://files.cccinspire.com/uploads/1/3/1/3/131383977/8a7a801a5c.pdf
    • http://files.mccandlesslighting.com/uploads/1/3/1/3/131380251/xojibala_vujek_kewuw.pdf
    • https://tilakomo.files.wordpress.com/2020/07/28815827533.pdf
    • https://xevugonabaw.files.wordpress.com/2020/06/41754724918.pdf
    • https://poxakelab872419281.files.wordpress.com/2020/07/rifenelidokelukogebuvene.pdf
    • https://datefakifeba.files.wordpress.com/2020/06/lefufuze.pdf
    • https://wadedala728945907.files.wordpress.com/2020/06/26178571795.pdf
    • https://nonepagok.files.wordpress.com/2020/06/nakilanexokokuj.pdf
    • https://ladisipe.files.wordpress.com/2020/06/90114981881.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.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_off00007771.bin
70bd14c2947a57ccffd0ab9dd208e712db89b5ca27477518144b28d3741a3061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7771 4960 bytes
font_01_sfnt_off0000885a.bin
6aabb86210d0a3b1be480063206aa507315b3d5a7ddf1ff866c2e7a80b3366f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885A 10480 bytes

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