Malicious PDF — malware analysis report

Static analysis result for SHA-256 157b79e49cb38356…

MALICIOUS

PDF

52.0 KB Created: 2020-08-20 14:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3db7e10577c2e5de1580847747a7efb0 SHA-1: 0df805855547ceeea1c1ee916e8f6f0cdb0a4636 SHA-256: 157b79e49cb38356a118d18021e7c16f0a9b41d7ed4ac86e079faf44b2459d6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a search query, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL confirms a malicious intent to lead users to harmful content.

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=video+lagu+armand+maulana+sebelah+mata
    • http://files.phantomlightning.com/uploads/1/3/1/4/131408017/469bc2a50.pdf
    • http://files.ashleymaltzmd.com/uploads/1/3/1/4/131437246/364952.pdf
    • http://files.naturesowncharcoal.com/uploads/1/3/0/7/130739188/3534145.pdf
    • http://naxolip.fountainheadmuseum.com/uploads/1/3/1/3/131379830/7368621.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/77932776470.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9950/files/52963968878.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/61377888344.pdf
    • https://cdn.shopify.com/s/files/1/0428/9055/9655/files/camille_paglia_libros.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/87765263286.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/developmental_psychology_childhood_and_adolescence.pdf
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/country_code_213.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/tejotanoralofum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/36697508346.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5988/files/atoms_and_elements_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2946/files/53450202290.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ca.bin
3e6e7ee23f854ee19c7167c2789acb3491f21e8e20173aa89a1f601019dc2fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 5228 bytes
font_01_sfnt_off00007356.bin
045c1ba9f82f6ec83dccba1a54b01359ba0168060d2f533d3074eba8e71e5686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7356 13620 bytes
font_02_sfnt_off00009eb1.bin
3c260b720ba846d87de456033c05b94d326aa9f09b16dabc19f167f97f6ae321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB1 16204 bytes
font_03_sfnt_off0000b3e1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 4324 bytes

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