Malicious PDF — malware analysis report

Static analysis result for SHA-256 085c89f0522f79bc…

MALICIOUS

PDF

43.5 KB Created: 2020-08-22 12:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 031b4d7a26c499f46bb24e5fe2d8b6a8 SHA-1: 56eaaf57ea7fe9e5d4bd78a4f7de19287b6eb130 SHA-256: 085c89f0522f79bc2d7278444d2f1f71e88baaec1b9cbafcfd10197f0c512205
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.com/pify?keyword=how+to+write+abstracts+in+apa+format', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. No scripts were extracted, and the file type is PDF, indicating a likely spearphishing attachment.

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=how+to+write+abstracts+in+apa+format
    • http://veroxa.ernst-arch.com/uploads/1/3/0/7/130776132/b881083659.pdf
    • http://files.dsconway.com/uploads/1/3/0/8/130873997/zusodonapija-bapiwu-jutebiremabekos.pdf
    • http://files.tionalee.com/uploads/1/3/0/7/130738710/lazazefedurixela.pdf
    • http://vadiri.dliqr.com/uploads/1/3/1/6/131606260/kazebedijepid-sirem-ruzakubazitoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8685957786.pdf
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/third_eye_chakra_meditation.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/toxaretilirol.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/77106412126.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/winepadedazesusekina.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/joverima.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/6608750570.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/lufitok.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/xafugak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/dodijuzeruzedowurelo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7347/files/78091906762.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/form_14_missouri.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_off00006c22.bin
35aec405e63da1b7ca8b17028ec94194d0dbb9a228cfea9e1b602cf309ae558b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C22 5320 bytes
font_01_sfnt_off00007e2c.bin
5e60851704a0f3c84d8f958576be6c1294e5236bbb29602b0e1f87e950d56963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2C 10120 bytes

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