Malicious PDF — malware analysis report

Static analysis result for SHA-256 606b40dd1401d6d8…

MALICIOUS

PDF

67.3 KB Created: 2020-08-06 13:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b3e9ac3886aec1b4f99af4146b74a1 SHA-1: d9317fdc9b00931855e658a7e3e34c3c2c78cbf5 SHA-256: 606b40dd1401d6d81ca819a3321c829f35138ff169a0f1dafa545b45fcc05367
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector, suggesting an attempt to lure users to malicious content. 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.com/pify?keyword=benim+hocam+e%25C4%259Fitim+bilimleri+deneme+pdf
    • http://files.fuego-flamingo.com/uploads/1/3/2/7/132740978/dujomisuna.pdf
    • http://files.statebirdtogo.com/uploads/1/3/2/7/132710687/a1b067.pdf
    • http://jekanezov.lantanaprivatewealth.com.au/uploads/1/3/1/0/131070786/vulinivenametefon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/14878519114.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/41297136969.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/javutibekib.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/xoduju.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/zotabiwegatafexalufow.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/21897685848.pdf
    • https://cdn.shopify.com/s/files/1/0437/9901/9682/files/alimentos_alcalinos_contra_el_cancer.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/canon_sx720_hs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/breves_cuentos_hispanos_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/linew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/72587426437.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7147/files/dipif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/nuvaxepagos.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/12257164871.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b846.bin
2999c64be827c17872f3d7c306f349119676f9c47aeb4df9b6d17ba59f73f94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 5636 bytes
font_01_sfnt_off0000cb43.bin
1caf6c6623ba2207acac4c71bb391d493c8d221553217da635d7d2c92b8acb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 17488 bytes

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