Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72dc1de4bfda68c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 11:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f312f9a20734898b5a11cb27cc6900e8 SHA-1: edf759a209935483fb27faae2feaafbe74d6078f SHA-256: c72dc1de4bfda68c85d04ff26c8f67fe8ce025e5beb5435324187985815cad84
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'calibre mac free'. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload. The ML classifier 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=calibre++mac+free
    • http://zugemune.cocrimeanalysis.org/uploads/1/3/0/8/130814526/4667793.pdf
    • http://files.haynesgolf.org/uploads/1/3/2/7/132740464/aeabe83ba9.pdf
    • http://files.madebeautifulbyscars.com/uploads/1/3/1/4/131437474/6b1d3a.pdf
    • http://files.riverosphotography.com/uploads/1/3/1/6/131637021/ef22c4a49.pdf
    • http://files.nooksackvalleyriders.org/uploads/1/3/1/6/131607374/499896.pdf
    • https://cdn.shopify.com/s/files/1/0437/3600/6810/files/59171727313.pdf
    • https://cdn.shopify.com/s/files/1/0435/9841/3987/files/mandated_reporter_post_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/automotive_market_research.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/15910800463.pdf
    • https://cdn.shopify.com/s/files/1/0434/8972/2534/files/chicken_little_game_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/kobalejimeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/proyecto_caldera_de_vapor.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/management_information_systems_rainer_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/tenugolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/pujepisujumofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/dupopomuzomajiluvadoka.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7095/files/32696074452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.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_off0000638a.bin
e7636e8689bbfdfd93e101b695ec4b29829a3b629f24bc674e4bb872bada861f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 4896 bytes
font_01_sfnt_off0000741a.bin
6b6f986b3a3297e818044be0201581817988ad365a10d705b1b2ae281a7f3efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741A 10272 bytes

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