Malicious PDF — malware analysis report

Static analysis result for SHA-256 13258959f316a27a…

MALICIOUS

PDF

55.5 KB Created: 2020-08-23 17:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e33704876f770aacab4dcb382f34565 SHA-1: 2f1b654dfa0515fe7873ed0429d971dc4c4c08e7 SHA-256: 13258959f316a27abe4fced92f44c4c6108dc22df848497006ff5ce37c7d412f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to drive traffic to potentially malicious sites or engage in link farming. The ML classifier also 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.com/pify?keyword=tomb+of+terror+hearthstone+guide
    • http://funifima.heartsofhorsehaven.org/uploads/1/3/0/9/130969723/togajefejiriluka.pdf
    • http://files.scarecon.org/uploads/1/3/0/8/130874566/29647e00ca1c2be.pdf
    • http://luxazabej.mitzimileskubota.com/uploads/1/3/1/3/131383664/tevumolekipujot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/42468261056.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/clinical_biochemistry_text_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/1433/9235/files/relative_clauses_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/texubamebujuwowelifoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/abnormal_psychology_ann_kring_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/88778764695.pdf
    • https://cdn.shopify.com/s/files/1/0428/1512/7708/files/cowsep_yi_build.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/26993283979.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/86457565362.pdf
    • https://cdn.shopify.com/s/files/1/0431/0886/0065/files/bcom_books_shivaji_university.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/rofupefijobojixekig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/butterknife_android_studio_setup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/xuvosilagewofuzosodozek.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009baa.bin
de0fccc60e41b9f35ae15333d987a9cc57305bcc701ee9a750c1921c41b32a41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAA 5376 bytes
font_01_sfnt_off0000adcc.bin
fe0289f62007576b54c629ca3332bdac6bca6ff5a7b0f7d218bd7fa9bbefd649		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADCC 10364 bytes

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