Malicious PDF — malware analysis report

Static analysis result for SHA-256 131c1d4bb71f4291…

MALICIOUS

PDF

39.3 KB Created: 2020-08-17 11:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21071676fc66a9e9b38c9e2bf6e99894 SHA-1: 49eb641414c8c3d2d047087e09b9dcedce38d569 SHA-256: 131c1d4bb71f429160f6d89fd0301786305dc22f7e2c26e1d9f40eed062966f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains references to AWS API Gateway and CloudFormation, suggesting a pretext for the malicious links. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination.

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=aws+api+gateway+custom+domain+cloudformation
    • http://muxalu.act-sat-tutors.com/uploads/1/3/0/9/130969679/2e92670419cb271.pdf
    • http://tasereda.skylinevisioning.com/uploads/1/3/1/3/131380058/8424742.pdf
    • http://files.goodtimesatlanta.com/uploads/1/3/2/6/132695662/1912e73c17ee4de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/1181/3015/files/77211343704.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/30496548389.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/business_plan_product.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/1_99_herblore_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/8326/8257/files/sumozudanowam.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/10222140757.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/beechcraft_king_air_350_poh.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/xipekerobugoruvovare.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/rerofijugaduvumon.pdf
    • https://cdn.shopify.com/s/files/1/0451/4296/6426/files/navevenuxiguneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/31113512374.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/geranakurunogabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/speaking_activities_for_esl_adults.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_off00005a5b.bin
6f0b04f857dadc4b6c6c7035e7877ddb2c87f24accc60277359de5aa8feaa505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5B 5660 bytes
font_01_sfnt_off00006d96.bin
2033635a5a58f14b755180c11fed9d5787f9a2682c0c6149349dc45665682275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 9980 bytes

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