Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cdbb13d14c8f02…

MALICIOUS

PDF

53.0 KB Created: 2020-08-19 06:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3a19d44a337a69ce39564710044517 SHA-1: df40d91efd25853159efd9eae7be5b7b0f7cf078 SHA-256: a7cdbb13d14c8f026f890b0a6c1d17edacc4f6440cc242876e9983e23254955d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with one critical heuristic identifying it as a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=3d+hidden+pictures+and+answers'. Another critical heuristic flags it as a PDF link farm, with many links pointing to PDFs hosted on cdn.shopify.com and other domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links and the identified malicious redirector suggest an attempt to lure users to potentially harmful content or manipulate search engine results.

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=3d+hidden+pictures+and+answers
    • http://files.emilynotman.co.uk/uploads/1/3/2/6/132682819/posewinulemevi.pdf
    • http://files.iancuttingphotography.co.uk/uploads/1/3/0/7/130776089/6629342.pdf
    • http://files.theawedlife.com/uploads/1/3/1/4/131437636/kimun.pdf
    • http://files.brockdvickers.com/uploads/1/3/2/6/132682913/xudefevakulaviwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/wofedamo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/11371691319.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/fixunig.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/83447119014.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/53559732480.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/1730984725.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/portfolio_lighting_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006502.bin
761df9e3f766bc76804c9f362706e5019568eb274d3be16e645431e342dbc69c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 5292 bytes
font_01_sfnt_off000076f1.bin
294ea7bf4c978c9af29a94cd063858c3c014104c2d92b60fbb83d5ae95145de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F1 5472 bytes
font_02_sfnt_off00008a81.bin
87167a4efb5af6156b335bf79045422767990b46013fb012440211524c7e90e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A81 11048 bytes
font_03_sfnt_off0000b00e.bin
44d9c922acaebf0bd89bbc2f700668b039ba04d1dda10151fc3f369deea26354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00E 16512 bytes

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