Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e374679d4c6d55…

MALICIOUS

PDF

100.2 KB Created: 2020-08-09 22:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f64815b97f9ae79872358ab6b264a239 SHA-1: a04554e5d94822b5fa1185ffefecc512cb8dfc8e SHA-256: 18e374679d4c6d553345f0167987e01e59bc17e6717a77dafb8484cee2b2db73
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'chapter 11 to kill a mockingbird pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or exploits.

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.cc/pify?keyword=chapter+11+to+kill+a+mockingbird+pdf
    • http://files.stephenmazujian.com/uploads/1/3/0/7/130738928/3725725.pdf
    • http://files.travelwithkalsi.com/uploads/1/3/1/0/131070827/512140.pdf
    • http://files.ulrichhoeche.com/uploads/1/3/0/7/130740298/2502780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/96169427437.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/97726489357.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/52349365464.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/xometarazaneve.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/31912579871.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/6043838296.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0430/0429/7375/files/14664798277.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/luxolomugovamijujewir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/vijerideda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140b7.bin
04f1a059a3dc09a9c0bac837088a1d2bb187bfb3104dae30c9f215afedcb0b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 5456 bytes
font_01_sfnt_off0001531e.bin
7bd28e45618f547c551398de0fc7308313a3277e3d9b92e67b9efe77e734ca0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1531E 10008 bytes
font_02_sfnt_off0001753c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1753C 4324 bytes

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