Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb9e02952914526…

MALICIOUS

PDF

41.9 KB Created: 2020-08-12 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cab53eb55e03148230099de67e50ca10 SHA-1: 1a2b544c5cddd55613f8299db29d8525ce98fb79 SHA-256: 2bb9e02952914526a9666ee51519693c7978cb12ad8f5855a4f3a948efe27780
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.ru. The document body, though obfuscated, contains the same URL, suggesting a lure for users to click on a "character quiz pdf". The ML classifier strongly indicates maliciousness, and the PDF structure is consistent with link-farming or redirection abuse.

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=character+quiz+pdf
    • http://files.bravenewshakespeare.org/uploads/1/3/1/6/131606094/7924191.pdf
    • http://files.valleygraceevents.net/uploads/1/3/0/9/130969505/siwavetizov.pdf
    • http://vefukaf.tipifarfelu.com/uploads/1/3/1/1/131164250/2304768.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/10589714537.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/navpers_1616_26.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/fajojivuromowezux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/bakery_business_model.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4930/files/53972834741.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/90274970532.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/8295150293.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/deborah_r._nelson-_mathers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/samples_of_formal_letter.pdf
    • https://cdn.shopify.com/s/files/1/0434/7310/9152/files/catan_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/calendario_agosto_2020_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0436/9950/3257/files/poisson_probability_distribution_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0999/files/tunilubone.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/lakufixejakadowerala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000589a.bin
2fc531ac4ffe08627cff7a32a62c82cb9b8c07cd27e45cda82d5bfdb27d208e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589A 4900 bytes
font_01_sfnt_off00006960.bin
34cd2e63a61e9f4848493a99ace5ff896c95c9b0b9e1d277ed328b5e15551ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6960 10412 bytes
font_02_sfnt_off00008cf3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF3 4324 bytes

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