Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb8647c1926f37b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-20 02:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31ac2f3584c1e0fe06ce6b06d314e96 SHA-1: 4e914417eb9c515df92ecd684f748a8d695389c6 SHA-256: deb8647c1926f37bcc8d2e3da15da572be82251e291a760066bd4bf159495e43
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating it's a malicious redirector link. Another critical heuristic identified it as a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to 'coverkids income guidelines 2019' and wkhtmltopdf metadata, but the primary malicious activity appears to be the extensive use of external links.

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.ru/pify?keyword=coverkids+income+guidelines+2019
    • http://files.indivisibletucson.org/uploads/1/3/0/7/130739369/bagedewevove.pdf
    • http://monomado.wellnessbyoluchi.com/uploads/1/3/1/3/131383664/4080344.pdf
    • http://files.theeblacksocialite.com/uploads/1/3/0/9/130969663/lixojufe.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/78764899582.pdf
    • https://cdn.shopify.com/s/files/1/0428/6965/3663/files/java_random_number_between_1_and_100.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/nomuribepu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/masesadubor.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/75476339420.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/alfabeto_arabe_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/catalogue_noel_carrefour_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/xoxalopimi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3443/files/13183170445.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/18937822838.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/diagnostico_social_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/aisi_cold_formed_steel_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/xinazorupuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/perijosetokonogona.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/mokolopexabolirelov.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_off00006a54.bin
9b658efbffb43c1a97efa88334645f6f33b2bcb5e3d1c9904751b9fd352f8e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 5560 bytes
font_01_sfnt_off00007d39.bin
86d2fd48d43a0c61af9a261d6f2db242b461d12d590f28e520dd4f57dd3c4c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D39 11316 bytes

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