Malicious PDF — malware analysis report

Static analysis result for SHA-256 7463403c90fb9142…

MALICIOUS

PDF

44.3 KB Created: 2020-08-11 03:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0d2734c7d28c38ef8bbe6e59129e74 SHA-1: 938238d69f2d9510c43e0aa0873805efdc7b0bcd SHA-256: 7463403c90fb9142c1b0dfe8cd1e05ffc4295587e8a04b37e362de4686d533d5
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are hosted on Shopify. The embedded document body text, though partially corrupted, contains the malicious URL and text related to 'anterior cruciate ligament anatomy pdf', suggesting a lure to encourage clicks. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=anterior+cruciate+ligament+anatomy+pdf
    • http://gafog.betsynorris.com/uploads/1/3/1/6/131606248/rebasugatiwalu_wowotamejejod_rakipal_fotoruzuwunav.pdf
    • http://tixebekul.daniellebanas.com/uploads/1/3/1/3/131383791/fekotem.pdf
    • http://gibolaxe.heartmends.com/uploads/1/3/1/4/131453060/ffd1749d.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/najikujevobofinulobojisob.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/birotirusevanonetuvon.pdf
    • https://cdn.shopify.com/s/files/1/0451/7101/5829/files/76252686656.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/83013835809.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/xomeruse.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/vekujaxumajizelepa.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/gedevezujazaritenowakip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3971/8552/files/kavuguj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/94596212171.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/make_bed_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38655606666.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6762/files/21914834829.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/fedebuzubozezidol.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_off00006f52.bin
adc6e93abf29699bf103dbac3053c67c962f040be0e9019862d0843bb14ebd0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F52 5388 bytes
font_01_sfnt_off00008196.bin
914ecd60c387d318d38b34a112286f86cd8a4acc0425ec21d366ba3f7a7420cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8196 10296 bytes

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