Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55772d835d85edb…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 23:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34b1e3bddff8f2a8fa27a1be0b93877a SHA-1: 5a5f0831c688628344bca44f0071ab582c03a095 SHA-256: e55772d835d85edb77256065f5962eb9b4212fd0f89ada4ed254646a0fbbeea1
152 Risk Score

Malware Insights

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

The PDF 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 text, though partially corrupted, includes the phrase 'The french lieutenant's woman critical analysis pdf' and the malicious redirector URL, suggesting a lure to download or analyze a PDF, which instead leads to a malicious site. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=the%20french%20lieutenant
    • http://files.laundrydayinc.com/uploads/1/3/2/3/132303219/mipebitemo_lowizen.pdf
    • http://bozifuxi.grow-grace.com/uploads/1/3/0/8/130813306/5024056.pdf
    • http://files.sarahhawkyard.com/uploads/1/3/1/6/131606951/viwezepujijuma_negefutus_rujowatasosisiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/merapari.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/xutulutinunulamo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0465/5773/files/99130185744.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/kebaxemasupunomowenamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/calidad_de_vida_segun_la_oms.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/application_form_for_employment.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/newikonumitesiwaxabofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5109/files/approaches_and_methods_in_language_teaching_vk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2687/files/fupezebat.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/88733329200.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/cecil_medicine_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/nogapisasaxemidodizonug.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/lutobamibe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b46.bin
9964b16b15b4ff05bf9ecabcf07d8b8b92aa17ab081dcafdcad0e2f4ee799e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B46 5572 bytes
font_01_sfnt_off00007e24.bin
40f61049668f11c1bc0a4bf9ffe3375def7b069e4037e222d562b59bc5d5337a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E24 9868 bytes

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