Malicious PDF — malware analysis report

Static analysis result for SHA-256 98885e5c79e7cce1…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 17:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef64246cc31b5f450de113605175e5e8 SHA-1: 8399090d30e7c2e342fbf214bc697c8907165ad1 SHA-256: 98885e5c79e7cce13480e75acc0899f87c7dd3a069651da00935c5b226d2f97d
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a scholarship form and the malicious URL, suggesting a phishing lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a link farm, likely for SEO poisoning or distributing malicious 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.com/pify?keyword=vidyasaarathi+scholarship+online+form+2018
    • http://files.certraxapp.com/uploads/1/3/0/7/130776673/kiwuselijilosopojo.pdf
    • http://files.heimler-international.com/uploads/1/3/1/0/131070561/9650110.pdf
    • http://files.greaterfayettecountychamber.org/uploads/1/3/1/4/131408056/lokadumasup.pdf
    • http://mibokefun.windycityhorrorama.com/uploads/1/3/0/9/130969515/8392166.pdf
    • https://cdn.shopify.com/s/files/1/0437/8515/8813/files/accounting_concepts_and_conventions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/19593622990.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/remy_anorganick_chemie.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6010/files/73547678161.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/cyanogen_lg_g3.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/92666351703.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/random_discord_servers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/ink_chromatography_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/bbmas_2019_bts_performance_time.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/rumunozejulenizetenesep.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/18912731306.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/95263043979.pdf
    • https://cdn.shopify.com/s/files/1/0450/3502/8630/files/blank_marriage_certificate_download.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_off00006b61.bin
300b69f060a3587cbcff000a31dd3360e1954c4b2543e3a8967f9912ca7d1da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B61 5980 bytes
font_01_sfnt_off00007fa0.bin
fabcb518af16272beefd96c1bba9f81213cb1c82f1efc23b9ca2fcaaa6e63acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA0 10244 bytes

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