Malicious PDF — malware analysis report

Static analysis result for SHA-256 21883d943e58d354…

MALICIOUS

PDF

39.3 KB Created: 2020-08-01 22:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30d3cba1769433ed97a1c33c0dbe10d1 SHA-1: ba1d61c36e6fbbbcfa2b810d93d3cc0fdab4b909 SHA-256: 21883d943e58d354f97aba00ec6f1399c78c8a1f5bf152bed790cea7935a8498
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that a link within the PDF redirects to known malicious infrastructure at 'ttraff.cc'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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=fundations+teacher%2527+s+manual+pdf
    • http://files.thymeaftertimecafe.com/uploads/1/3/0/7/130738928/1190984.pdf
    • http://files.alveston.org/uploads/1/3/1/6/131637108/5663407.pdf
    • http://files.unityfayettebc.org/uploads/1/3/1/6/131606133/palitajusesebul-fogukepi-gututipivonaze.pdf
    • http://files.thebeachcompanysc.com/uploads/1/3/0/9/130969735/5369831.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/35310499508.pdf
    • https://cdn.shopify.com/s/files/1/0428/4301/3287/files/nunefatadexirub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/31219413398.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/papep.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/niriwukibapedufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/92099411786.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/pozowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/vebasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/sazewugefafulojebewas.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/75299406264.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/lifugagowuvavap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/lasutopumajegumajiwo.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_off000057c2.bin
dc95034a455c8504bca42d96f4c282d23460989f6a5ba66dc422826867cf7bca
pdf-font-stream PDF embedded font (sfnt) at offset 0x57C2 5384 bytes
font_01_sfnt_off000069ee.bin
195a9a170ca6ca35ec0e81a1bd59149ff0f7ced78d9770dc646b6a5b6c7ae870
pdf-font-stream PDF embedded font (sfnt) at offset 0x69EE 10724 bytes