Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23c9bf3d303b243…

MALICIOUS

PDF

52.5 KB Created: 2020-08-13 01:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f64dffcb9bdcf4c5fe8179ae214ad5 SHA-1: d0512a9117cbfa094fc9067c3a8dd17bdd1d31f1 SHA-256: a23c9bf3d303b24331c7833a04c508c136996c8f725840497dabb2c7148d9bd4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=microplastics+in+the+philippines+pdf. The document body, though partially corrupted, contains the same keyword, suggesting a lure. 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.cc/pify?keyword=microplastics+in+the+philippines+pdf
    • http://rixetugiv.jvstuff.com/uploads/1/3/0/8/130874493/6fde7b9bd1.pdf
    • http://zujeg.rencommunicatons.com/uploads/1/3/2/6/132683286/fasumefipabowo.pdf
    • http://files.jphono1.com/uploads/1/3/2/6/132696621/dowalewozidod.pdf
    • http://files.childneurologyconsulting.com/uploads/1/3/1/8/131871633/8167844.pdf
    • http://files.stephens.org.uk/uploads/1/3/1/6/131637589/relokinumoxamap.pdf
    • https://cdn.shopify.com/s/files/1/0433/8663/4390/files/taiwan_subway_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/2791/4152/files/fidufex.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/after_effect_tutorial_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/que_es_el_calvinismo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/zitovemomamukatawe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9688/1814/files/39025289692.pdf
    • https://cdn.shopify.com/s/files/1/0433/6962/7799/files/37796672154.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/jugamisavaroxepunowoxadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/45395340058.pdf
    • https://cdn.shopify.com/s/files/1/0432/0840/9250/files/30351122478.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/zuwujagijagabupedapujaki.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6565/files/noriko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/birujuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/85486259055.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6112/files/lawuvikutefirezox.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_off00008f56.bin
80374aa955c400cccf41c7829bbd6f52126151b1c4bbea1e2afd6401527c07b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 5248 bytes
font_01_sfnt_off0000a120.bin
94c2e4174c1610a77aab8ef70ecc1397e2c50e0420fa4270e7ed005ec373366a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA120 10360 bytes

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