Malicious PDF — malware analysis report

Static analysis result for SHA-256 482b9ba09ae8b4b1…

MALICIOUS

PDF

51.7 KB Created: 2020-08-03 14:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc691aa4bb593e377d4f48771722cb90 SHA-1: 7e3ce4401a87dd54217acec713fa7d46230fe123 SHA-256: 482b9ba09ae8b4b127a86d16e1bdb13ceb93268dc3e73aaa7338f7ef0c47f418
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. The document body and embedded links suggest a lure for downloading content, likely to lead to malware. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, further supporting a malicious intent.

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=tamil+news+paper+download+pdf
    • http://files.gammasupport.org/uploads/1/3/2/6/132681342/603244.pdf
    • http://files.klrider.com/uploads/1/3/1/3/131380120/xukurowafosufir-derubigezad-zisew-nowixojubuda.pdf
    • http://files.wilmington1to1.com/uploads/1/3/1/4/131406518/jipujerek-kazurupuna-juxosofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/76607296149.pdf
    • https://cdn.shopify.com/s/files/1/0438/2477/5330/files/dowofifexenut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/6870104276.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/iron_maiden_wasted_years_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/67959816806.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/42069087159.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/vipijezasudiwagidax.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/2598698107.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/33923975513.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/42091324261.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6667/files/merzbacher_quantum_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/veguvonijenubevafulaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006766.bin
301ec8b510586db300a1c8d6dbd1960597502f8226ce25ef416b8af5097c87f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6766 5228 bytes
font_01_sfnt_off00007923.bin
606157225d4ff6436cd578acf3617b25f5851e3bb57590fb0e89a802a6c5437a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 4220 bytes
font_02_sfnt_off00008756.bin
97870b02e24d5841bcd58175fc90a7b8dbe698647765e29dbd7585ce194959a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8756 10744 bytes
font_03_sfnt_off0000ac3c.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3C 16164 bytes

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